Predict your puppy's adult weight with our easy-to-use tool.
Puppy Weight Predictor
Enter your puppy's current age in months (e.g., 3).
Enter your puppy's current weight in kilograms (e.g., 5).
Small (Adult < 10kg)
Medium (Adult 10-25kg)
Large (Adult 25-45kg)
Giant (Adult > 45kg)
Select your puppy's expected adult breed size.
Average
Fast
Slow
How quickly is your puppy growing compared to others of the same age?
Estimated Full Grown Weight
— kg
Range: — kg
Weeks to Full Growth: —
Current Growth Factor: —
Formula: Predicted Weight = Current Weight * (Adult Weight Factor / Current Age Factor) * Growth Adjustment
Weight Prediction Chart
This chart visualizes your puppy's projected weight gain over time based on the inputs provided.
Weight Prediction Table
Projected Puppy Weight Progression
Age (Months)
Predicted Weight (kg)
Growth Stage
What is Dog Weight Prediction?
Dog weight prediction, often referred to as estimating a puppy's full grown weight, is the process of forecasting the adult size of a young dog based on various factors. This involves analyzing current weight, age, breed characteristics, and growth patterns to provide an educated guess about how large the dog will be when it reaches maturity. Understanding your puppy's potential adult weight is crucial for several reasons, including proper nutrition planning, appropriate exercise routines, and anticipating potential health issues related to size and weight.
Who Should Use a Dog Weight Predictor?
Anyone who has recently welcomed a puppy into their home, especially those with mixed breeds or puppies whose lineage isn't fully known, can benefit from using a dog weight predictor. New puppy owners often wonder, "How big will my dog get?" This tool helps answer that question. It's also useful for:
Prospective dog owners deciding on a breed or size that fits their lifestyle.
Breeders monitoring growth and development.
Veterinarians and pet professionals providing guidance to owners.
Owners concerned about whether their puppy is growing too fast or too slow.
Common Misconceptions About Puppy Weight Prediction
Several myths surround puppy weight prediction. One common misconception is that a puppy's adult weight is solely determined by its current weight and breed. While these are significant factors, other elements like diet, health, and individual genetics play a vital role. Another myth is that all puppies of a certain breed will reach the exact same adult weight. In reality, there's always a range, and individual variation is normal. Finally, some believe that once a puppy passes a certain age (like 6 months), its adult weight is already fixed, which isn't entirely true; growth can continue, albeit at a slower pace, until maturity.
Dog Weight Prediction Formula and Mathematical Explanation
The calculation for predicting a dog's full grown weight is not an exact science but rather an estimation based on established growth patterns and influencing factors. A common approach involves using a formula that considers the puppy's current age, current weight, breed size category, and an adjustment for its growth rate. The core idea is to extrapolate the current growth trajectory to estimate the final adult weight.
The Formula
A simplified, yet effective, formula can be represented as:
Predicted Adult Weight (kg) = Current Weight (kg) * (Adult Weight Factor / Current Age Factor) * Growth Adjustment
Variable Explanations
Let's break down the components of this dog weight prediction formula:
Variables in the Dog Weight Prediction Formula
Variable
Meaning
Unit
Typical Range/Values
Current Weight
The puppy's weight at the time of calculation.
kg
0.1 kg and above
Current Age
The puppy's age in months.
Months
1 – 24 months
Breed Size
Categorization based on expected adult weight.
Category
Small, Medium, Large, Giant
Growth Rate
Indicates if the puppy is growing faster, slower, or at an average pace.
Category
Slow, Average, Fast
Adult Weight Factor
A multiplier derived from the breed size category, representing a typical adult weight range.
Multiplier
Small: ~0.5, Medium: ~1.0, Large: ~1.5, Giant: ~2.0 (These are illustrative and can be refined)
Current Age Factor
A multiplier based on the puppy's age, reflecting how much of its growth is typically completed. Younger puppies have a higher factor.
Multiplier
Varies inversely with age (e.g., 1 month = high factor, 12 months = low factor)
Growth Adjustment
A modifier based on the estimated growth rate (e.g., 1.1 for fast, 0.9 for slow, 1.0 for average).
Multiplier
0.9 – 1.2
Predicted Adult Weight
The estimated final weight of the dog.
kg
Variable
Mathematical Derivation Simplified
The formula essentially works by:
Establishing a Baseline: The current weight is the starting point.
Scaling by Age and Size: The ratio of 'Adult Weight Factor' to 'Current Age Factor' helps to scale the current weight towards an expected adult weight. Younger puppies (higher Current Age Factor) will see a larger projected increase, while older puppies will see a smaller one. The Adult Weight Factor ensures the projection aligns with the general size category.
Adjusting for Growth Pace: The 'Growth Adjustment' fine-tunes the prediction based on whether the puppy is currently growing faster or slower than average for its age and size.
The specific values for 'Adult Weight Factor' and 'Current Age Factor' are often derived from veterinary growth charts and breed standards, making the prediction more accurate for different sizes.
Practical Examples (Real-World Use Cases)
Example 1: Medium-Sized Puppy
Scenario: Sarah has a 4-month-old Labrador mix puppy named Max. Max currently weighs 8 kg. Based on his parents' size, Sarah expects him to be a medium to large breed. She observes he's eating well and seems to be growing steadily, so she selects 'Average' for his growth rate.
Current Age: 4 months
Current Weight: 8 kg
Breed Size: Medium (assuming typical Lab size falls here for simplicity)
Growth Rate: Average
Calculation (Illustrative):
Let's assume for a Medium breed, Adult Weight Factor = 1.0.
Let's assume for 4 months old, Current Age Factor = 0.4 (meaning ~40% of growth is done).
Growth Adjustment for Average = 1.0.
Predicted Adult Weight = 8 kg * (1.0 / 0.4) * 1.0 = 8 kg * 2.5 * 1.0 = 20 kg.
Result Interpretation: The calculator estimates Max will likely reach an adult weight of around 20 kg. Sarah can use this information to ensure she's feeding him the appropriate amount of puppy food for a medium-large breed and to anticipate his exercise needs as he grows.
Example 2: Small Breed Puppy with Fast Growth
Scenario: John has a 3-month-old Dachshund puppy named Daisy. Daisy currently weighs 3 kg. He knows she's a Dachshund and expects her to remain a small breed. However, Daisy is a very enthusiastic eater and seems to be gaining weight rapidly, so John selects 'Fast' for her growth rate.
Current Age: 3 months
Current Weight: 3 kg
Breed Size: Small (assuming typical Dachshund size)
Growth Rate: Fast
Calculation (Illustrative):
Let's assume for a Small breed, Adult Weight Factor = 0.5.
Let's assume for 3 months old, Current Age Factor = 0.5 (meaning ~50% of growth is done).
Growth Adjustment for Fast = 1.1.
Predicted Adult Weight = 3 kg * (0.5 / 0.5) * 1.1 = 3 kg * 1.0 * 1.1 = 3.3 kg.
Result Interpretation: The calculator predicts Daisy will reach an adult weight of approximately 3.3 kg. Although the initial calculation might seem low, the 'Fast' growth rate adjustment pushes it slightly higher than a simple age/size extrapolation. John should monitor her weight closely and consult his vet to ensure her rapid growth is healthy and not indicative of overfeeding or other issues.
How to Use This Dog Weight Predictor Calculator
Using our puppy weight predictor is straightforward. Follow these simple steps to get an estimated adult weight for your furry friend:
Enter Current Age: Input your puppy's current age in months. Most puppies are considered adults between 12-24 months, depending on breed size.
Enter Current Weight: Provide your puppy's current weight in kilograms. Be as accurate as possible.
Select Breed Size: Choose the category that best represents your puppy's expected adult size (Small, Medium, Large, or Giant). If you have a mixed breed, consider the size of the larger parent or consult breed standards for similar mixes.
Choose Growth Rate: Select 'Average', 'Fast', or 'Slow' based on your observation of your puppy's growth compared to others of the same age and breed. Is your puppy a chunky monkey or a lean bean?
View Results: Click the 'Calculate' button (or watch the results update automatically). The calculator will display the primary predicted adult weight, an estimated weight range, the projected time until full growth, and a current growth factor.
How to Read Results
Predicted Adult Weight: This is the most likely final weight for your dog.
Estimated Adult Weight Range: Provides a lower and upper bound, acknowledging that individual growth can vary.
Weeks to Full Growth: Gives an idea of how much longer your puppy is expected to grow.
Current Growth Factor: A metric indicating how your puppy's current growth compares to the average for its age and size. A factor above 1 suggests faster-than-average growth.
Decision-Making Guidance
Use these predictions as a guide, not a definitive rule. Consult your veterinarian regularly to monitor your puppy's growth. If the predicted weight seems significantly different from what you expected, or if your puppy's growth curve deviates sharply from the projections, discuss it with your vet. This information can help you adjust food portions, choose appropriate toys and bedding, and prepare for the space your adult dog will occupy.
Key Factors That Affect Dog Weight Results
While our calculator provides a solid estimate, several real-world factors can influence a dog's final adult weight. Understanding these nuances can help you interpret the results more effectively:
Genetics and Breed: This is the most significant factor. Purebred dogs have predictable size ranges based on breed standards. Mixed breeds can be less predictable, inheriting traits from different breeds, which can lead to variations in size.
Nutrition and Diet: The quality and quantity of food play a critical role. A diet lacking essential nutrients can stunt growth, while overfeeding can lead to obesity and a higher adult weight than genetically intended. Puppy-specific food is crucial for proper development.
Health and Medical Conditions: Certain health issues, such as parasites, hormonal imbalances (like hypothyroidism), or chronic illnesses, can affect a puppy's growth rate and final weight. Regular veterinary check-ups are essential to catch and manage these conditions.
Spay/Neuter Status: Research suggests that spaying or neutering a dog, especially before puberty, can sometimes lead to a slightly higher adult weight. This is often due to changes in metabolism and hormonal profiles, potentially leading to a longer growth period.
Exercise and Activity Level: While exercise is vital for health, extremely high levels of activity in very young puppies could potentially impact bone development. Conversely, a lack of exercise can contribute to weight gain and obesity later in life.
Individual Variation: Just like humans, every dog is an individual. Even within the same litter, puppies can have slightly different growth rates and final weights due to subtle genetic differences and environmental factors.
Age at Maturity: Different breeds mature at different rates. Large and giant breeds often continue to grow and fill out for up to 18-24 months, while smaller breeds might reach their full size closer to 9-12 months. Our calculator uses age as a key input.
Frequently Asked Questions (FAQ)
Q1: How accurate is a puppy weight predictor?
A: Puppy weight predictors provide estimates, not guarantees. They are based on averages and common growth patterns. Individual genetics, diet, health, and environment can cause variations. They are best used as a guideline.
Q2: At what age is a puppy considered fully grown?
A: This varies significantly by breed size. Small breeds are typically fully grown around 9-12 months. Medium breeds might reach their full size by 12-15 months. Large and giant breeds can continue growing and filling out until they are 18-24 months old.
Q3: My puppy is a mixed breed. How do I choose the right breed size?
A: For mixed breeds, it can be trickier. Consider the size of the parents if known. If one parent is significantly larger, the puppy might lean towards that size. You can also research common breed mixes and their typical adult sizes. If unsure, selecting a slightly larger category might be safer for nutritional planning.
Q4: What if my puppy is growing much faster than the prediction?
A: Rapid growth can sometimes be a concern, especially for large breeds, as it can lead to developmental orthopedic issues. It's essential to consult your veterinarian. They can assess your puppy's growth curve, diet, and overall health to determine if the rapid growth is healthy or requires intervention.
Q5: My puppy seems underweight. What should I do?
A: If you're concerned your puppy is underweight, the first step is always a veterinary check-up. They can rule out underlying medical conditions. If the puppy is healthy, your vet can advise on appropriate diet adjustments, ensuring you're feeding a high-quality puppy food in the correct portions for their age and expected adult size.
Q6: Does the type of food affect predicted weight?
A: Yes, indirectly. While the calculator doesn't directly factor in food type, the quality and caloric density of the food significantly impact growth. Feeding a balanced, high-quality puppy food appropriate for the dog's size category supports healthy growth. Poor nutrition can lead to a lower-than-predicted weight, while excessive calories can lead to a higher weight.
Q7: Can I use this calculator for older dogs?
A: No, this calculator is specifically designed for puppies and young dogs that are still growing. It relies on growth rate estimations that are only applicable during the developmental stages. For adult dogs, focus shifts to maintaining a healthy weight rather than predicting growth.
Q8: What is the 'Current Growth Factor' telling me?
A: The 'Current Growth Factor' is a ratio that compares your puppy's current growth rate to the average growth rate expected for a puppy of its age and size. A factor significantly above 1.0 suggests your puppy is growing faster than average, while a factor below 1.0 indicates slower-than-average growth. This helps refine the final weight prediction.
Related Tools and Internal Resources
Puppy Food CalculatorCalculate the appropriate daily food intake for your growing puppy based on age, weight, and activity level.
Dog Breed SelectorFind the perfect dog breed that matches your lifestyle, living situation, and preferences.
Dog Exercise Needs GuideUnderstand how much physical activity different breeds and ages require to stay healthy and happy.
Puppy Vaccination ScheduleTrack and manage your puppy's essential vaccination appointments to ensure they are protected.
Senior Dog Care TipsLearn how to provide the best care for your aging canine companion, focusing on health and comfort.
Dog Health CheckerA tool to help identify potential health issues based on symptoms, providing guidance on when to see a vet.
var currentAgeMonthsInput = document.getElementById('currentAgeMonths');
var currentWeightKgInput = document.getElementById('currentWeightKg');
var breedSizeSelect = document.getElementById('breedSize');
var growthRateSelect = document.getElementById('growthRate');
var predictedWeightDiv = document.getElementById('predictedWeight');
var estimatedAdultWeightRangeDiv = document.getElementById('estimatedAdultWeightRange');
var weeksToFullGrowthDiv = document.getElementById('weeksToFullGrowth');
var currentGrowthFactorDiv = document.getElementById('currentGrowthFactor');
var weightTableBody = document.querySelector('#weightTable tbody');
var chartCanvas = document.getElementById('weightChart');
var chartInstance = null;
// Default values for factors (can be adjusted based on more detailed data)
var adultWeightFactors = {
small: 0.5, // Represents a multiplier towards a typical small adult weight
medium: 1.0, // Represents a multiplier towards a typical medium adult weight
large: 1.5, // Represents a multiplier towards a typical large adult weight
giant: 2.0 // Represents a multiplier towards a typical giant adult weight
};
// Approximate age factors (higher for younger puppies, lower for older)
// These represent the proportion of growth typically completed by that age.
// Example: At 1 month, ~20% growth done; at 6 months, ~70% growth done.
var ageFactors = {
1: 0.20, 2: 0.30, 3: 0.40, 4: 0.48, 5: 0.55, 6: 0.62,
7: 0.68, 8: 0.72, 9: 0.76, 10: 0.79, 11: 0.82, 12: 0.85,
13: 0.87, 14: 0.89, 15: 0.91, 16: 0.92, 17: 0.93, 18: 0.94,
19: 0.95, 20: 0.96, 21: 0.97, 22: 0.98, 23: 0.99, 24: 1.00
};
var growthAdjustments = {
slow: 0.90,
average: 1.00,
fast: 1.15
};
function validateInput(inputId, errorId, min, max, isNumber = true) {
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var value = input.value.trim();
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errorDiv.classList.remove('visible');
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if (!isValid) {
input.style.borderColor = '#dc3545';
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input.style.borderColor = '#ddd'; // Reset to default
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function calculateDogWeight() {
var currentAgeMonths = parseFloat(currentAgeMonthsInput.value);
var currentWeightKg = parseFloat(currentWeightKgInput.value);
var breedSize = breedSizeSelect.value;
var growthRate = growthRateSelect.value;
var allValid = true;
allValid &= validateInput('currentAgeMonths', 'currentAgeMonthsError', 1, 24);
allValid &= validateInput('currentWeightKg', 'currentWeightKgError', 0.1);
// Breed size and growth rate are selects, so they are always valid if a value is present
if (!allValid) {
predictedWeightDiv.textContent = '– kg';
estimatedAdultWeightRangeDiv.textContent = 'Range: — kg';
weeksToFullGrowthDiv.textContent = 'Weeks to Full Growth: –';
currentGrowthFactorDiv.textContent = 'Current Growth Factor: –';
clearChartAndTable();
return;
}
var adultWeightFactor = adultWeightFactors[breedSize] || 1.0;
var currentAgeFactor = ageFactors[currentAgeMonths] || 0.5; // Default if age is out of range
var growthAdjustment = growthAdjustments[growthRate] || 1.0;
// Ensure currentAgeFactor is not zero to avoid division by zero
if (currentAgeFactor === 0) currentAgeFactor = 0.01;
var predictedWeight = currentWeightKg * (adultWeightFactor / currentAgeFactor) * growthAdjustment;
// Calculate a plausible range (e.g., +/- 15%)
var lowerBound = predictedWeight * 0.85;
var upperBound = predictedWeight * 1.15;
// Estimate weeks to full growth (simplified: assumes growth stops around 18-24 months for most)
var typicalMaturityMonths = 18; // Default, can be adjusted by breed size
if (breedSize === 'small') typicalMaturityMonths = 12;
if (breedSize === 'giant') typicalMaturityMonths = 24;
var remainingGrowthMonths = Math.max(0, typicalMaturityMonths – currentAgeMonths);
var remainingGrowthWeeks = Math.round(remainingGrowthMonths * 4.33); // Approx weeks per month
// Calculate current growth factor
// This is a simplified ratio: (Expected weight at this age for adult size) / (Current weight)
// A more robust calculation would involve comparing to breed-specific growth charts.
// For simplicity here, we'll use a ratio related to age and adult factor.
var expectedWeightAtCurrentAge = currentWeightKg * (adultWeightFactor / currentAgeFactor); // This is a rough estimate of what the dog *should* weigh if growing perfectly towards adult size
var currentGrowthFactor = currentWeightKg / expectedWeightAtCurrentAge; // If current weight is higher than expected, factor > 1
if (isNaN(currentGrowthFactor) || !isFinite(currentGrowthFactor)) currentGrowthFactor = 1.0; // Handle potential division by zero or invalid results
predictedWeightDiv.textContent = predictedWeight.toFixed(2) + ' kg';
estimatedAdultWeightRangeDiv.textContent = 'Range: ' + lowerBound.toFixed(2) + ' – ' + upperBound.toFixed(2) + ' kg';
weeksToFullGrowthDiv.textContent = 'Weeks to Full Growth: ' + remainingGrowthWeeks;
currentGrowthFactorDiv.textContent = 'Current Growth Factor: ' + currentGrowthFactor.toFixed(2);
updateChartAndTable(currentWeightKg, predictedWeight, currentAgeMonths, breedSize, growthRate);
}
function updateChartAndTable(currentWeight, predictedWeight, currentAge, breedSize, growthRate) {
// Update Table
weightTableBody.innerHTML = "; // Clear previous rows
var tableData = [];
var numSteps = 10; // Number of points to show in the table/chart
var maxAge = 24; // Max age to show in the table/chart
var stepAge = maxAge / numSteps;
var currentWeightForTable = currentWeight;
var currentAgeForTable = currentAge;
// Add current data point first
tableData.push({
age: currentAgeForTable,
weight: currentWeightForTable,
stage: 'Current'
});
// Generate future data points
for (var i = 1; i <= numSteps; i++) {
var nextAge = Math.min(maxAge, currentAgeForTable + stepAge);
var nextAgeFactor = ageFactors[Math.round(nextAge)] || ageFactors[maxAge]; // Use rounded age, fallback to max age factor
if (nextAgeFactor === 0) nextAgeFactor = 0.01;
var adultWeightFactor = adultWeightFactors[breedSize] || 1.0;
var growthAdjustment = growthAdjustments[growthRate] || 1.0;
// Recalculate predicted weight based on the age for this step
var projectedWeightAtNextAge = currentWeight * (adultWeightFactor / nextAgeFactor) * growthAdjustment;
// Ensure weight doesn't decrease if growth slows significantly
if (projectedWeightAtNextAge currentAgeForTable) {
projectedWeightAtNextAge = currentWeightForTable * 1.05; // Small increase to show continued growth
}
var stage = 'Growing';
if (nextAge >= 12) stage = 'Approaching Adult';
if (nextAge >= maxAge) stage = 'Adult';
tableData.push({
age: nextAge.toFixed(1),
weight: projectedWeightAtNextAge.toFixed(2),
stage: stage
});
currentWeightForTable = projectedWeightAtNextAge;
currentAgeForTable = nextAge;
}
// Populate table
tableData.forEach(function(data) {
var row = weightTableBody.insertRow();
var cellAge = row.insertCell(0);
var cellWeight = row.insertCell(1);
var cellStage = row.insertCell(2);
cellAge.textContent = data.age;
cellWeight.textContent = data.weight + ' kg';
cellStage.textContent = data.stage;
});
// Update Chart
if (chartInstance) {
chartInstance.destroy();
}
var labels = tableData.map(function(item) { return item.age + ' mo'; });
var weights = tableData.map(function(item) { return parseFloat(item.weight); });
// Create a second series for expected adult weight range
var lowerRange = weights.map(function(w, index) {
// This is a simplified representation. A true range would be more complex.
// For visualization, we'll show a band around the predicted weight.
var basePredicted = predictedWeight * (adultWeightFactors[breedSize] || 1.0) / (ageFactors[parseFloat(labels[index])] || 0.5) * (growthAdjustments[growthRate] || 1.0);
return (basePredicted * 0.85).toFixed(2);
});
var upperRange = weights.map(function(w, index) {
var basePredicted = predictedWeight * (adultWeightFactors[breedSize] || 1.0) / (ageFactors[parseFloat(labels[index])] || 0.5) * (growthAdjustments[growthRate] || 1.0);
return (basePredicted * 1.15).toFixed(2);
});
var ctx = chartCanvas.getContext('2d');
chartInstance = new Chart(ctx, {
type: 'line',
data: {
labels: labels,
datasets: [{
label: 'Projected Weight (kg)',
data: weights,
borderColor: 'var(–primary-color)',
backgroundColor: 'rgba(0, 74, 153, 0.1)',
fill: false,
tension: 0.1
},
{
label: 'Estimated Adult Range (kg)',
data: lowerRange.map((l, i) => ({ x: labels[i], y: parseFloat(l) })), // Lower bound
borderColor: 'rgba(40, 167, 69, 0.5)',
backgroundColor: 'rgba(40, 167, 69, 0.2)',
fill: '+1', // Fills to the next dataset (upperRange)
tension: 0.1,
pointRadius: 0 // Hide points for range
},
{
label: 'Estimated Adult Range (kg)', // This dataset is just for the upper bound of the fill
data: upperRange.map((u, i) => ({ x: labels[i], y: parseFloat(u) })), // Upper bound
borderColor: 'rgba(40, 167, 69, 0.0)', // Transparent line
backgroundColor: 'rgba(40, 167, 69, 0.0)', // Transparent fill
tension: 0.1,
pointRadius: 0
}]
},
options: {
responsive: true,
maintainAspectRatio: true,
scales: {
x: {
title: {
display: true,
text: 'Age (Months)'
}
},
y: {
title: {
display: true,
text: 'Weight (kg)'
},
beginAtZero: true
}
},
plugins: {
tooltip: {
callbacks: {
label: function(context) {
var label = context.dataset.label || ";
if (label) {
label += ': ';
}
if (context.parsed.y !== null) {
label += context.parsed.y.toFixed(2) + ' kg';
}
return label;
}
}
},
legend: {
display: true,
position: 'top'
}
}
}
});
}
function clearChartAndTable() {
weightTableBody.innerHTML = ";
if (chartInstance) {
chartInstance.destroy();
chartInstance = null;
}
// Reset canvas context if needed, though destroy should handle it
var ctx = chartCanvas.getContext('2d');
ctx.clearRect(0, 0, chartCanvas.width, chartCanvas.height);
}
function resetForm() {
currentAgeMonthsInput.value = 3;
currentWeightKgInput.value = 5;
breedSizeSelect.value = 'medium';
growthRateSelect.value = 'average';
// Clear errors
document.getElementById('currentAgeMonthsError').textContent = ";
document.getElementById('currentWeightKgError').textContent = ";
document.getElementById('breedSizeError').textContent = ";
document.getElementById('growthRateError').textContent = ";
// Reset input borders
currentAgeMonthsInput.style.borderColor = '#ddd';
currentWeightKgInput.style.borderColor = '#ddd';
calculateDogWeight(); // Recalculate with default values
}
function copyResults() {
var mainResult = predictedWeightDiv.textContent;
var rangeResult = estimatedAdultWeightRangeDiv.textContent;
var weeksResult = weeksToFullGrowthDiv.textContent;
var growthFactorResult = currentGrowthFactorDiv.textContent;
var assumptions = "Assumptions:\n" +
"- Current Age: " + currentAgeMonthsInput.value + " months\n" +
"- Current Weight: " + currentWeightKgInput.value + " kg\n" +
"- Breed Size: " + breedSizeSelect.options[breedSizeSelect.selectedIndex].text + "\n" +
"- Growth Rate: " + growthRateSelect.options[growthRateSelect.selectedIndex].text;
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mainResult + "\n" +
rangeResult + "\n" +
weeksResult + "\n" +
growthFactorResult + "\n\n" +
assumptions + "\n\n" +
"Formula Used: Predicted Weight = Current Weight * (Adult Weight Factor / Current Age Factor) * Growth Adjustment";
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textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'Results copied to clipboard!' : 'Failed to copy results.';
// Optionally show a temporary message to the user
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copyFeedback.textContent = msg;
copyFeedback.style.cssText = 'position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: var(–primary-color); color: white; padding: 15px; border-radius: 5px; z-index: 1000;';
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setTimeout(function() {
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console.error('Fallback: Oops, unable to copy', err);
// Optionally show an error message
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document.body.removeChild(textArea);
}
// Initial calculation on page load
calculateDogWeight();
// Add event listeners for real-time updates
currentAgeMonthsInput.addEventListener('input', calculateDogWeight);
currentWeightKgInput.addEventListener('input', calculateDogWeight);
breedSizeSelect.addEventListener('change', calculateDogWeight);
growthRateSelect.addEventListener('change', calculateDogWeight);
// Add validation listeners
currentAgeMonthsInput.addEventListener('blur', function() { validateInput('currentAgeMonths', 'currentAgeMonthsError', 1, 24); });
currentWeightKgInput.addEventListener('blur', function() { validateInput('currentWeightKg', 'currentWeightKgError', 0.1); });
// Load Chart.js library dynamically if not already present
if (typeof Chart === 'undefined') {
var script = document.createElement('script');
script.src = 'https://cdn.jsdelivr.net/npm/chart.js@3.7.0/dist/chart.min.js'; // Use a specific version
script.onload = function() {
console.log('Chart.js loaded.');
calculateDogWeight(); // Recalculate after chart library is loaded
};
script.onerror = function() {
console.error('Failed to load Chart.js library.');
};
document.head.appendChild(script);
} else {
// If Chart.js is already loaded, ensure calculation happens
calculateDogWeight();
}