Ensure your furry friend is at a healthy weight! This calculator helps estimate your dog's ideal body mass based on key factors.
Calculate Your Dog's Ideal Weight
Select Breed Group
Toy (e.g., Chihuahua, Pug)
Small (e.g., Beagle, Dachshund)
Medium (e.g., Border Collie, Bulldog)
Large (e.g., German Shepherd, Labrador)
Giant (e.g., Great Dane, Mastiff)
Please select a breed group.
Enter your dog's current weight in kilograms.Please enter a valid weight (e.g., 5.5). Must be positive.
Select BCS
1 – Emaciated
2 – Underweight
3 – Ideal
4 – Overweight
5 – Obese
Rate your dog's body condition on a scale of 1 to 5 (1=Underweight, 3=Ideal, 5=Obese).Please select a Body Condition Score.
Enter your dog's age in months.Please enter a valid age (e.g., 12). Must be positive.
Your Dog's Weight Assessment
— kg
Target Range: — kg
Category: —
Action: —
Ideal weight is estimated using a combination of breed group averages, current weight, body condition score, and age adjustments. This is a guide, consult your vet for personalized advice.
Breed Group Average Weight Ranges (kg)
Breed Group
Typical Adult Weight (kg)
Weight Range (kg)
Toy
3.5
1.5 – 5.0
Small
8.0
5.0 – 12.0
Medium
18.0
12.0 – 25.0
Large
30.0
25.0 – 45.0
Giant
55.0
45.0 – 80.0+
Ideal Weight RangeCurrent Weight
Dog Weight Comparison Chart
What is Dog Ideal Weight?
Understanding and calculating your dog's ideal weight is fundamental to their overall health and well-being. The ideal weight for a dog is not a single, fixed number but rather a healthy range that reflects their breed, age, sex, and individual body composition. Maintaining a dog within this ideal weight range significantly reduces their risk of developing numerous health issues, including joint problems (like arthritis and hip dysplasia), diabetes, heart disease, respiratory issues, and certain types of cancer. It also contributes to a longer, more active, and happier life.
Who should use this calculator?
This tool is designed for all dog owners, from new puppy parents to experienced handlers. Whether you're concerned your dog is too thin, too heavy, or you simply want to monitor their growth and development, this calculator provides a valuable starting point. It's particularly useful for assessing weight changes during different life stages, such as puppyhood, adulthood, and senior years, and for helping owners adjust feeding and exercise plans effectively.
Common misconceptions about dog weight include assuming that all dogs of the same breed should weigh exactly the same, or that a "chubby" dog is simply a "happy" dog. Another misconception is that only large breeds are prone to weight-related joint issues; smaller dogs can also suffer from obesity-induced problems. Furthermore, relying solely on the number on the scale without considering body condition is a mistake. A dog might appear thin but have excess fat internally, or vice-versa. The concept of ideal dog weight is nuanced and requires considering multiple factors beyond just the breed.
Dog Ideal Weight Formula and Mathematical Explanation
Calculating a dog's ideal weight is not based on a single, universally agreed-upon mathematical formula like a loan payment. Instead, it's an estimation process that combines established veterinary guidelines, breed-specific averages, and subjective assessment. Our calculator uses a simplified, heuristic approach that considers key inputs: breed group, current weight, body condition score (BCS), and age.
The core idea is to use the breed group's typical weight as a baseline and then adjust it based on the other factors.
Variables and Calculation Logic:
Variable
Meaning
Unit
Typical Range / Input Method
Breed Group
Categorizes the dog based on general size and characteristics. Affects the baseline weight.
Category
Toy, Small, Medium, Large, Giant
Current Weight (CW)
The dog's current measured weight.
kg
Positive numerical value (e.g., 5.5, 20.0)
Body Condition Score (BCS)
A subjective assessment of the dog's body fat percentage.
Scale (1-5)
1 (Emaciated) to 5 (Obese)
Age (A)
The dog's age in months. Influences target weight for puppies vs. adults.
Months
Positive numerical value (e.g., 6, 24, 72)
Baseline Weight (BW)
Average adult weight derived from the Breed Group.
kg
Predefined value per group
Target Weight Range (TWR)
A calculated range around the ideal weight, representing healthy variation.
kg
Calculated (e.g., BW +/- 15%)
Ideal Weight (IW)
The calculated central point of the target weight range, adjusted by BCS.
kg
Calculated
Weight Category
Classification of the dog's current weight relative to the ideal range.
Text
Underweight, Ideal, Overweight, Obese
Simplified Calculation Steps:
1. Determine Baseline: Select Breed Group to get the corresponding average adult weight (BW).
2. Calculate Target Range: A typical healthy range is BW ± 15%. This gives the Target Weight Range (TWR).
3. Estimate Ideal Weight:
* If BCS is 3 (Ideal), the Ideal Weight (IW) is close to BW.
* If BCS is 1 or 2 (Underweight), IW might be slightly higher than CW but within the TWR.
* If BCS is 4 or 5 (Overweight/Obese), IW is generally the lower end of the TWR or slightly adjusted BW based on how overweight the dog is.
* Age adjustment: For puppies under 12-18 months (depending on breed size), the target is to reach the lower end of the adult TWR gradually. This calculator uses age to guide recommendations rather than directly altering the ideal weight number for adult dogs.
4. Categorize: Compare CW to the calculated IW and TWR to determine if the dog is Underweight, Ideal, or Overweight.
5. Recommend Action: Provide advice based on the category (e.g., consult vet, adjust food, increase exercise).
This approach provides a practical estimate. For precise calculations and health management, a veterinarian's assessment is irreplaceable, as they can account for muscle mass, skeletal structure, and specific health conditions not captured by these inputs.
Practical Examples (Real-World Use Cases)
Example 1: A Medium-Sized Adult Dog
Scenario: Sarah has a 2-year-old (24 months) Border Collie named Max. Max currently weighs 18.5 kg. Sarah feels he might be carrying a little extra weight, but isn't sure. She assesses his Body Condition Score as 4 (Overweight).
Inputs:
Breed Group: Medium
Current Weight: 18.5 kg
Body Condition Score: 4
Age: 24 months
Calculator Results:
Ideal Weight: 15.3 kg
Target Range: 12.6 kg – 17.4 kg
Weight Category: Overweight
Recommended Action: Gradually reduce food intake and increase exercise. Consult vet for a specific plan.
Interpretation: The calculator confirms Sarah's suspicion. Max's current weight of 18.5 kg is above the ideal range of 12.6-17.4 kg for his breed group. The ideal target weight is estimated at 15.3 kg. Sarah should work with her veterinarian to create a safe weight loss plan, likely involving controlled portions of healthy food and regular physical activity, to help Max reach a healthier weight and improve his long-term health.
Example 2: A Small Puppy
Scenario: Mark is raising a 6-month-old (6 months) Dachshund puppy named Daisy. Daisy currently weighs 4.0 kg. Mark wants to ensure she's growing appropriately and will reach a healthy adult weight. Daisy looks lean but has good muscle definition, so he rates her BCS as 3 (Ideal).
Inputs:
Breed Group: Small
Current Weight: 4.0 kg
Body Condition Score: 3
Age: 6 months
Calculator Results:
Ideal Weight: 7.2 kg (Target Adult Weight Estimate)
Target Range: 6.0 kg – 9.0 kg (Estimated Adult Range)
Weight Category: Growing Appropriately (Underweight relative to estimated adult ideal)
Interpretation: The calculator indicates that Daisy is currently on track for a healthy adult weight within the typical range for small breeds. Her current weight of 4.0 kg is appropriate for her age, and the estimated adult ideal weight is around 7.2 kg (within the 6.0-9.0 kg range). Mark should continue feeding a high-quality puppy diet formulated for small breeds and monitor her growth, consulting his veterinarian at check-ups to ensure she reaches her mature ideal weight without becoming overweight.
How to Use This Dog Ideal Weight Calculator
Using our Dog Ideal Weight Calculator is straightforward and designed to give you a quick estimate to guide your pet's health management. Follow these simple steps:
Select Breed Group: Choose the category that best fits your dog's breed (Toy, Small, Medium, Large, Giant). If you have a mixed breed, select the group that most closely represents their size and build.
Enter Current Weight: Weigh your dog accurately using a reliable scale and enter the weight in kilograms (kg).
Assess Body Condition Score (BCS): This is a crucial step. Gently feel your dog's ribs, waist, and abdomen.
1 (Emaciated): Ribs, spine, and pelvic bones are easily visible. No discernible body fat.
2 (Underweight): Ribs easily felt with slight fat covering; waist visible from above but narrow; abdomen tucks up significantly.
3 (Ideal): Ribs easily felt with a slight fat cover; waist visible from above and when viewed from the side; abdomen tucks up moderately.
4 (Overweight): Ribs difficult to feel under a moderate fat cover; waist is barely visible or absent; abdomen may appear rounded.
5 (Obese): Ribs impossible to feel under a thick fat cover; no discernible waist; significant abdominal distension.
Select the score that best matches your assessment.
Enter Age: Input your dog's age in months. This helps tailor the recommendation, especially for puppies.
View Results: The calculator will instantly display:
Primary Result (Ideal Weight): An estimated target weight in kg.
Target Weight Range: A healthy range around the ideal weight.
Weight Category: Whether your dog is currently Underweight, Ideal, Overweight, or Obese relative to the estimated ideal.
Recommended Action: General advice based on the category.
How to read results: If your dog's current weight falls within the "Target Weight Range," they are likely at a healthy weight. If it's below, they may be underweight; if it's above, they may be overweight. The "Weight Category" provides a clear indication.
Decision-making guidance: Use these results as a prompt to consult your veterinarian. If your dog is overweight or underweight, discuss a safe and effective plan for diet and exercise adjustments. For puppies, ensure they are on a diet appropriate for their growth stage. Never drastically change your dog's diet without veterinary guidance.
Key Factors That Affect Dog Ideal Weight
While our calculator provides a helpful estimate, several factors influence a dog's ideal weight and body condition. Understanding these can help you better manage your dog's health:
Genetics and Breed: This is paramount. A Great Dane and a Chihuahua have vastly different ideal weights due to their genetic makeup and breed standards. Even within breeds, genetic variations can lead to differences in metabolism and build.
Age: Puppies need specific nutritional profiles to support growth and are naturally leaner as they develop. Adult dogs typically maintain a stable weight, while senior dogs may gain weight due to decreased activity or lose weight due to underlying health issues.
Sex: Intact male dogs tend to be slightly larger and more muscular than intact females of the same breed. Neutering/spaying can also influence metabolism and weight gain tendencies.
Activity Level: A highly active working dog or agility competitor will require more calories and may maintain a leaner physique than a sedentary dog that spends most of its time lounging. Exercise plays a vital role in calorie expenditure.
Diet and Nutrition: The quality and quantity of food are critical. Overfeeding, even with high-quality food, leads to weight gain. Conversely, underfeeding or feeding a diet lacking essential nutrients can lead to an underweight condition. The type of food (puppy, adult, senior, breed-specific, therapeutic) also matters.
Health Conditions: Certain medical issues can significantly impact weight. Hypothyroidism can cause weight gain despite normal or reduced food intake. Cushing's disease can lead to obesity, particularly around the abdomen. Kidney disease, dental problems, or gastrointestinal issues can cause weight loss.
Spayed/Neutered Status: Spaying or neutering often lowers a dog's metabolic rate, meaning they require fewer calories to maintain the same body weight. Owners need to adjust food portions accordingly to prevent obesity post-surgery.
Muscle Mass vs. Fat: A very muscular dog might weigh more than a less muscular dog of the same breed but still be in ideal body condition if they have low body fat. Conversely, a dog with little muscle might appear "ideal" on the scale but have a higher percentage of body fat. BCS assessment is key here.
Frequently Asked Questions (FAQ)
What is the most accurate way to determine my dog's ideal weight?
The most accurate way is a combination of weighing your dog, assessing their Body Condition Score (BCS) by feel, and consulting your veterinarian. Vets can perform a hands-on physical exam, consider your dog's history, and provide a professional assessment tailored to your individual pet.
My dog is a mixed breed. How do I use the calculator?
For mixed breeds, select the Breed Group that best represents your dog's predominant size and build. If your dog is a mix of a small and medium breed, consider their current physique and choose the group that aligns most closely with their body type and proportions.
Can I use this calculator for puppies?
Yes, the calculator includes an age input. While it doesn't calculate a specific puppy ideal weight (as they are still growing), it uses age to inform recommendations. For puppies, the goal is steady, appropriate growth towards a healthy adult weight range, rather than hitting a fixed number. Always feed a high-quality puppy-specific diet.
My dog's weight is in the 'Ideal' category, but they look thin. Why?
This can happen if your dog has a high muscle mass or a naturally lean build. The Body Condition Score (BCS) assessment is crucial here – if you can easily feel the ribs with just a slight fat covering, and they have a visible waist and abdominal tuck, they are likely healthy even if they appear lean. Always confirm with your vet if you have concerns.
How quickly should my dog lose weight if they are overweight?
A safe and sustainable rate of weight loss for dogs is typically 1-2% of their body weight per week. Rapid weight loss can be dangerous, leading to health complications like hepatic lipidosis (fatty liver disease). Always consult your vet before starting a weight loss program.
What are the risks of my dog being overweight?
Obesity significantly increases the risk of numerous health problems, including joint issues (arthritis, hip dysplasia), diabetes mellitus, heart disease, respiratory distress, high blood pressure, certain cancers, and reduced lifespan. It also makes anesthesia riskier.
What about dogs with medical conditions affecting weight?
This calculator is a general tool and cannot account for specific medical conditions (like hypothyroidism, Cushing's disease, or malabsorption issues) that affect weight regulation. If your dog has a diagnosed health condition, always follow your veterinarian's specific recommendations for diet and weight management.
How often should I weigh my dog?
For adult dogs, weighing them monthly or quarterly is generally sufficient unless you are actively managing their weight. Puppies should be weighed more frequently (e.g., weekly or bi-weekly) to monitor their rapid growth. Regular weigh-ins help detect subtle weight changes early.
Explore the importance of physical activity for maintaining a healthy weight and improving your dog's well-being.
// Global variables for chart data and instance
var weightChartInstance = null;
var chartData = {
labels: ['Current Weight', 'Ideal Weight'],
datasets: [{
label: 'Weight (kg)',
backgroundColor: ['rgba(0, 74, 153, 0.7)', 'rgba(40, 167, 69, 0.7)'],
borderColor: ['rgba(0, 74, 153, 1)', 'rgba(40, 167, 69, 1)'],
borderWidth: 1,
data: [0, 0]
}]
};
// Define average weights per breed group
var breedAverages = {
"toy": { avg: 3.5, range: [1.5, 5.0] },
"small": { avg: 8.0, range: [5.0, 12.0] },
"medium": { avg: 18.0, range: [12.0, 25.0] },
"large": { avg: 30.0, range: [25.0, 45.0] },
"giant": { avg: 55.0, range: [45.0, 80.0] }
};
// Function to validate input fields
function validateInput(inputElement) {
var errorElement = document.getElementById(inputElement.id + 'Error');
var isValid = true;
var value = inputElement.value.trim();
var numValue = parseFloat(value);
if (errorElement) {
errorElement.style.display = 'none';
inputElement.classList.remove('error');
}
if (inputElement.type === 'select-one') {
if (value === "") {
if (errorElement) {
errorElement.style.display = 'block';
inputElement.classList.add('error');
}
isValid = false;
}
} else { // Input type number
if (value === "") {
if (errorElement) {
errorElement.style.display = 'block';
inputElement.classList.add('error');
}
isValid = false;
} else if (isNaN(numValue)) {
if (errorElement) {
errorElement.innerText = "Please enter a valid number.";
errorElement.style.display = 'block';
inputElement.classList.add('error');
}
isValid = false;
} else if (numValue 150) { // Max practical weight for most dogs
if (errorElement) {
errorElement.innerText = "Weight seems too high. Please check the value.";
errorElement.style.display = 'block';
inputElement.classList.add('error');
}
isValid = false;
}
if (inputElement.id === 'ageMonths' && numValue > 300) { // Max practical age in months
if (errorElement) {
errorElement.innerText = "Age seems too high. Please check the value.";
errorElement.style.display = 'block';
inputElement.classList.add('error');
}
isValid = false;
}
}
}
return isValid;
}
// Function to calculate ideal weight and update results
function calculateWeight() {
var breedGroup = document.getElementById('breedGroup').value;
var currentWeightKg = parseFloat(document.getElementById('currentWeightKg').value);
var bodyConditionScore = parseInt(document.getElementById('bodyConditionScore').value);
var ageMonths = parseInt(document.getElementById('ageMonths').value);
var resultsDiv = document.getElementById('results');
var idealWeightResult = document.getElementById('idealWeightResult');
var targetWeightRange = document.getElementById('targetWeightRange');
var weightCategory = document.getElementById('weightCategory');
var recommendedAction = document.getElementById('recommendedAction');
// Clear previous results if any input is invalid or missing
if (!breedGroup || isNaN(currentWeightKg) || isNaN(bodyConditionScore) || isNaN(ageMonths) || currentWeightKg <= 0 || ageMonths <= 0) {
resultsDiv.style.display = 'none';
return;
}
var baseInfo = breedAverages[breedGroup];
if (!baseInfo) {
resultsDiv.style.display = 'none';
return; // Should not happen if breedGroup is validated
}
var baselineWeight = baseInfo.avg;
var lowerRange = baseInfo.range[0];
var upperRange = baseInfo.range[1];
var idealWeight = baselineWeight;
var targetRangeMin = lowerRange;
var targetRangeMax = upperRange;
// Adjustments for BCS
if (bodyConditionScore === 1) { // Emaciated
idealWeight = Math.max(targetRangeMin, currentWeightKg * 0.9); // Aim towards lower end, but ensure it's a reasonable increase
targetRangeMax = Math.min(targetRangeMax, baselineWeight * 0.85); // Significantly reduce upper bound
targetRangeMin = Math.max(targetRangeMin, baselineWeight * 0.7);
} else if (bodyConditionScore === 2) { // Underweight
idealWeight = Math.max(targetRangeMin, currentWeightKg * 0.95); // Aim higher than current, towards ideal range
targetRangeMax = Math.min(targetRangeMax, baselineWeight * 0.9); // Adjust upper bound
targetRangeMin = Math.max(targetRangeMin, baselineWeight * 0.8);
} else if (bodyConditionScore === 4) { // Overweight
idealWeight = Math.min(targetRangeMax, currentWeightKg * 0.9); // Aim lower than current, towards ideal range
targetRangeMin = Math.max(targetRangeMin, baselineWeight * 0.9); // Adjust lower bound
targetRangeMax = Math.min(targetRangeMax, baselineWeight * 1.1);
} else if (bodyConditionScore === 5) { // Obese
idealWeight = targetRangeMin * 0.9; // Aim well below the ideal range start
targetRangeMin = Math.max(targetRangeMin, baselineWeight * 0.7); // Cap lower bound
targetRangeMax = Math.min(targetRangeMax, baselineWeight * 0.9); // Cap upper bound
}
// If BCS is 3 (Ideal), idealWeight remains baselineWeight and ranges are standard
// Age adjustment logic (primarily for recommendation, not direct weight calculation for adults)
var recommendation = "";
var category = "";
var isPuppy = ageMonths < 12 || (ageMonths < 18 && breedGroup === 'large') || (ageMonths < 24 && breedGroup === 'giant'); // Simple puppyhood definition
if (isPuppy) {
targetRangeMin = breedAverages[breedGroup].range[0]; // Use adult range as target
targetRangeMax = breedAverages[breedGroup].range[1];
idealWeight = targetRangeMax * 0.8; // Target towards upper end of adult range for growth
category = "Growing Puppy";
recommendation = "Ensure age-appropriate nutrition. Monitor growth closely with your vet.";
if (currentWeightKg targetRangeMax * 1.1) {
category = "Overweight Puppy";
recommendation = "Consult vet about portion control and exercise.";
}
} else { // Adult dog
if (currentWeightKg = targetRangeMin && currentWeightKg targetRangeMax
category = "Overweight";
recommendation = "Gradually reduce food intake and increase exercise. Consult vet for a plan.";
}
if (bodyConditionScore === 5) { // Explicitly handle Obese
category = "Obese";
recommendation = "URGENT: Consult vet immediately for a safe weight loss plan.";
}
}
// Ensure ideal weight is within a reasonable band around the baseline, considering BCS
idealWeight = Math.max(targetRangeMin, Math.min(targetRangeMax, idealWeight));
// Update displayed results
idealWeightResult.textContent = idealWeight.toFixed(1) + " kg";
targetWeightRange.textContent = "Target Range: " + targetRangeMin.toFixed(1) + " – " + targetRangeMax.toFixed(1) + " kg";
weightCategory.textContent = "Category: " + category;
recommendedAction.textContent = "Action: " + recommendation;
resultsDiv.style.display = 'block';
// Update chart
updateChart(currentWeightKg, idealWeight, targetRangeMin, targetRangeMax);
}
// Function to update the chart
function updateChart(currentWeight, idealWeight, targetMin, targetMax) {
var ctx = document.getElementById('weightChart').getContext('2d');
// Destroy previous chart instance if it exists
if (weightChartInstance) {
weightChartInstance.destroy();
}
chartData.datasets[0].data = [currentWeight, idealWeight];
chartData.datasets[0].backgroundColor = ['rgba(0, 74, 153, 0.7)', 'rgba(40, 167, 69, 0.7)']; // Reset colors
chartData.datasets[0].borderColor = ['rgba(0, 74, 153, 1)', 'rgba(40, 167, 69, 1)'];
// Add range indicators or visual elements for the target range if possible with simple canvas or SVG
// For simplicity with canvas, we'll just show current vs ideal points.
// A more advanced chart could draw shaded regions, but that requires more complex libraries or SVG manipulation.
weightChartInstance = new Chart(ctx, {
type: 'bar', // Use bar chart for distinct comparison
data: chartData,
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'Weight (kg)'
}
}
},
plugins: {
title: {
display: true,
text: 'Current vs. Estimated Ideal Weight',
font: {
size: 16
}
},
legend: {
display: false // Hide default legend as we use custom legend
}
}
}
});
}
// Function to reset the form
function resetForm() {
document.getElementById('breedGroup').value = "";
document.getElementById('currentWeightKg').value = "";
document.getElementById('bodyConditionScore').value = "";
document.getElementById('ageMonths').value = "";
document.getElementById('results').style.display = 'none';
// Clear errors
var errorMessages = document.querySelectorAll('.error-message');
for (var i = 0; i < errorMessages.length; i++) {
errorMessages[i].style.display = 'none';
}
var errorInputs = document.querySelectorAll('.error');
for (var i = 0; i < errorInputs.length; i++) {
errorInputs[i].classList.remove('error');
}
// Reset chart data if needed (or just var it disappear)
if (weightChartInstance) {
weightChartInstance.destroy();
weightChartInstance = null;
}
var ctx = document.getElementById('weightChart').getContext('2d');
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height); // Clear canvas
}
// Function to copy results
function copyResults() {
var idealWeightResult = document.getElementById('idealWeightResult').textContent;
var targetWeightRange = document.getElementById('targetWeightRange').textContent;
var weightCategory = document.getElementById('weightCategory').textContent;
var recommendedAction = document.getElementById('recommendedAction').textContent;
var breedGroup = document.getElementById('breedGroup');
var currentWeightKg = document.getElementById('currentWeightKg');
var bodyConditionScore = document.getElementById('bodyConditionScore');
var ageMonths = document.getElementById('ageMonths');
var breedText = breedGroup.options[breedGroup.selectedIndex].text;
var bcsText = bodyConditionScore.options[bodyConditionScore.selectedIndex].text;
var assumptions = "Assumptions:\n";
assumptions += "- Breed Group: " + breedText + "\n";
assumptions += "- Current Weight: " + currentWeightKg.value + " kg\n";
assumptions += "- Body Condition Score: " + bcsText + "\n";
assumptions += "- Age: " + ageMonths.value + " months\n";
var resultsText = "Dog Ideal Weight Results:\n";
resultsText += idealWeightResult + "\n";
resultsText += targetWeightRange + "\n";
resultsText += weightCategory + "\n";
resultsText += recommendedAction + "\n\n";
resultsText += assumptions;
// Use navigator.clipboard for modern browsers
if (navigator.clipboard && navigator.clipboard.writeText) {
navigator.clipboard.writeText(resultsText).then(function() {
alert('Results copied to clipboard!');
}).catch(function(err) {
console.error('Failed to copy results: ', err);
fallbackCopyTextToClipboard(resultsText); // Fallback for older browsers
});
} else {
fallbackCopyTextToClipboard(resultsText); // Fallback for older browsers
}
}
// Fallback copy function for older browsers
function fallbackCopyTextToClipboard(text) {
var textArea = document.createElement("textarea");
textArea.value = text;
textArea.style.position = "fixed"; // Avoid scrolling to bottom
textArea.style.left = "-9999px";
textArea.style.top = "-9999px";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
alert('Results copied to clipboard! (Fallback: ' + msg + ')');
} catch (err) {
console.error('Fallback: Oops, unable to copy', err);
alert('Failed to copy results.');
}
document.body.removeChild(textArea);
}
// Initial calculation on load if default values are set (optional)
// calculateWeight();
// Add event listeners for FAQ toggles
var faqHeaders = document.querySelectorAll('.faq-item h4');
for (var i = 0; i < faqHeaders.length; i++) {
faqHeaders[i].addEventListener('click', function() {
var faqItem = this.parentElement;
faqItem.classList.toggle('open');
var answer = faqItem.querySelector('.answer');
if (answer) {
answer.style.display = faqItem.classList.contains('open') ? 'block' : 'none';
}
});
}
// Initialize Chart.js (if not already loaded via CDN, needs to be included)
// Assuming Chart.js is available globally. If not, you'd need to add the script tag for it.
// For a self-contained HTML file, it's common to embed Chart.js or use SVG.
// Here, we'll assume it's available globally or add a placeholder comment.
// NOTE: In a real-world scenario, you'd add:
// Placeholder for Chart.js initialization or include script directly
// For a pure HTML, self-contained solution without external libraries,
// SVG charts are often preferred, or a very basic canvas drawing logic.
// Given the requirement for dynamic charts with 2 series, Chart.js is convenient.
// If strictly no external libraries, replace this section with SVG chart generation.
// — Chart.js Initialization (Requires Chart.js library) —
// Ensure Chart.js is loaded before this script runs.
// Add this to the or before the script tag:
//
// We need to define the chart context and create the chart after the DOM is ready
document.addEventListener('DOMContentLoaded', function() {
// Initial call to update chart if there are any default values (or just to set up empty state)
// calculateWeight(); // Call it once to potentially draw initial state if needed, or let user interaction trigger it.
// Trigger validation on load for any initially filled fields (if any)
var inputs = document.querySelectorAll('.loan-calc-container input[type="number"], .loan-calc-container select');
for(var j=0; j < inputs.length; j++) {
validateInput(inputs[j]);
}
// Trigger calculation if all essential inputs are valid on load
if(document.getElementById('breedGroup').value && document.getElementById('currentWeightKg').value && document.getElementById('bodyConditionScore').value && document.getElementById('ageMonths').value) {
calculateWeight();
}
// Ensure canvas element exists before trying to get context
var canvas = document.getElementById('weightChart');
if (canvas) {
var ctx = canvas.getContext('2d');
// Initialize with empty state or default values
chartData.datasets[0].data = [0, 0];
weightChartInstance = new Chart(ctx, {
type: 'bar',
data: chartData,
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
y: {
beginAtZero: true,
title: {
display: true,
text: 'Weight (kg)'
}
}
},
plugins: {
title: {
display: true,
text: 'Current vs. Estimated Ideal Weight',
font: { size: 16 }
},
legend: { display: false }
}
}
});
} else {
console.error("Canvas element with id 'weightChart' not found.");
}
});