Estimate your dog's ideal weight and track their growth journey with our comprehensive tool.
Dog Weight & Growth Tracker
Please enter your dog's breed.
Please enter a valid age in months.
Please enter a valid current weight in kg.
Please enter a valid estimated adult weight in kg.
Male
Female
Select your dog's gender.
Low (e.g., senior, less active)
Medium (e.g., average adult)
High (e.g., working dog, very active)
Choose the level that best describes your dog's daily exercise.
Your Dog's Weight Insights
Enter details to see results
Key Metrics:
Weight Status: –
Growth Stage: –
Ideal Weekly Gain: –
Estimated Daily Calorie Needs: – kcal
How It Works:
This calculator estimates your dog's current growth stage and provides an ideal weight range based on their breed's typical adult size. It also estimates daily calorie needs, considering age, current weight, activity level, and gender. For puppies, it projects ideal weekly weight gain. For adults, it assesses if they are underweight, at a healthy weight, or overweight compared to their estimated adult target.
Growth Projection (Puppy Stage)
Shows current weight against projected ideal growth curve for puppies.
Weight & Growth Summary
Metric
Value
Notes
Breed
–
–
Age
–
Months
Current Weight
– kg
–
Est. Adult Weight
– kg
–
Gender
–
–
Activity Level
–
–
Weight Status
–
–
Growth Stage
–
–
Ideal Weekly Gain
– kg/week
(Puppies)
Est. Daily Calories
– kcal
–
var ctx = null;
var growthChart = null;
function isValidNumber(value, min, max) {
var num = parseFloat(value);
return !isNaN(num) && num >= min && num <= max;
}
function showError(elementId, message, show) {
var errorElement = document.getElementById(elementId);
if (errorElement) {
errorElement.innerText = message;
errorElement.style.display = show ? 'block' : 'none';
}
}
function calculateDogWeight() {
var breed = document.getElementById("breed").value.trim();
var currentAgeMonths = document.getElementById("currentAgeMonths").value;
var currentWeightKg = document.getElementById("currentWeightKg").value;
var estimatedAdultWeightKg = document.getElementById("estimatedAdultWeightKg").value;
var gender = document.getElementById("gender").value;
var activityLevel = document.getElementById("activityLevel").value;
var errorsFound = false;
// Validation
if (breed === "") {
showError("breedError", "Please enter your dog's breed.", true);
errorsFound = true;
} else {
showError("breedError", "", false);
}
if (!isValidNumber(currentAgeMonths, 0, 200)) { // Max age roughly 16 years
showError("currentAgeMonthsError", "Please enter a valid age in months (0-200).", true);
errorsFound = true;
} else {
showError("currentAgeMonthsError", "", false);
}
if (!isValidNumber(currentWeightKg, 0.1, 150)) { // Max weight reasonable
showError("currentWeightKgError", "Please enter a valid current weight in kg (0.1-150).", true);
errorsFound = true;
} else {
showError("currentWeightKgError", "", false);
}
if (!isValidNumber(estimatedAdultWeightKg, 1, 150)) { // Max weight reasonable
showError("estimatedAdultWeightKgError", "Please enter a valid estimated adult weight in kg (1-150).", true);
errorsFound = true;
} else {
showError("estimatedAdultWeightKgError", "", false);
}
if (errorsFound) {
// Clear results if there are errors
document.getElementById("primaryResult").innerText = "Please correct errors above.";
document.getElementById("weightStatus").innerText = "Weight Status: -";
document.getElementById("growthStage").innerText = "Growth Stage: -";
document.getElementById("idealWeeklyGain").innerText = "Ideal Weekly Gain: -";
document.getElementById("calorieNeeds").innerText = "Estimated Daily Calorie Needs: – kcal";
updateTable("-", "-", "-", "-", "-", "-", "-", "-", "-", "-");
clearChart();
return;
}
// Calculations
var currentAgeMonthsNum = parseFloat(currentAgeMonths);
var currentWeightKgNum = parseFloat(currentWeightKg);
var estimatedAdultWeightKgNum = parseFloat(estimatedAdultWeightKg);
var weightStatus = "";
var growthStage = "";
var idealWeeklyGain = "-";
var calorieNeeds = 0;
var isPuppy = currentAgeMonthsNum < 12; // Assuming 12 months is roughly adulthood
// Growth Stage Determination
if (isPuppy) {
growthStage = "Puppy (Growing)";
} else {
growthStage = "Adult";
}
// Weight Status Calculation
var weightRatio = currentWeightKgNum / estimatedAdultWeightKgNum;
if (weightRatio = 0.90 && weightRatio 0) {
idealWeeklyGain = ((estimatedAdultWeightKgNum – currentWeightKgNum) / weeksRemaining).toFixed(2) + " kg/week";
} else {
idealWeeklyGain = "N/A (Near Adult)";
}
}
// Calorie Needs Estimation (Simplified MER formula)
// RER = 70 * (weight^0.75)
var rer = 70 * Math.pow(currentWeightKgNum, 0.75);
var activityFactor = 1.0;
if (activityLevel === "low") {
activityFactor = 1.2; // Lower end for less active adults
} else if (activityLevel === "medium") {
activityFactor = 1.5; // Average adult
} else if (activityLevel === "high") {
activityFactor = 2.0; // Active dogs
}
// Adjust factor slightly for puppies if needed, though often higher
if (isPuppy) {
activityFactor = Math.max(activityFactor, 1.8); // Ensure puppies get enough calories
activityFactor = Math.min(activityFactor, 2.5); // Cap for very active puppies
} else if (gender === "female" && currentAgeMonthsNum > 18) { // Lower factor for spayed adults
activityFactor *= 0.9;
}
calorieNeeds = rer * activityFactor;
calorieNeeds = Math.round(calorieNeeds);
// Display Results
var primaryResultText = weightStatus;
if (isPuppy) {
primaryResultText = "Puppy Growth";
}
document.getElementById("primaryResult").innerText = primaryResultText;
document.getElementById("weightStatus").innerText = "Weight Status: " + weightStatus;
document.getElementById("growthStage").innerText = "Growth Stage: " + growthStage;
document.getElementById("idealWeeklyGain").innerText = "Ideal Weekly Gain: " + idealWeeklyGain;
document.getElementById("calorieNeeds").innerText = "Estimated Daily Calorie Needs: " + calorieNeeds + " kcal";
// Update Table
updateTable(breed, currentAgeMonths, currentWeightKg, estimatedAdultWeightKg, gender, activityLevel, weightStatus, growthStage, idealWeeklyGain, calorieNeeds);
// Update Chart
updateChart(currentWeightKgNum, estimatedAdultWeightKgNum, currentAgeMonthsNum, isPuppy);
}
function updateTable(breed, age, currentWeight, estAdultWeight, gender, activity, weightStatus, growthStage, idealGain, calories) {
document.getElementById("summaryBreed").cells[1].innerText = breed || "-";
document.getElementById("summaryAge").cells[1].innerText = age + " Months" || "-";
document.getElementById("summaryCurrentWeight").cells[1].innerText = currentWeight + " kg" || "-";
document.getElementById("summaryEstAdultWeight").cells[1].innerText = estAdultWeight + " kg" || "-";
document.getElementById("summaryGender").cells[1].innerText = gender.charAt(0).toUpperCase() + gender.slice(1) || "-";
document.getElementById("summaryActivity").cells[1].innerText = activity.charAt(0).toUpperCase() + activity.slice(1) || "-";
document.getElementById("summaryWeightStatus").cells[1].innerText = weightStatus || "-";
document.getElementById("summaryGrowthStage").cells[1].innerText = growthStage || "-";
document.getElementById("summaryIdealGain").cells[1].innerText = idealGain === "-" ? "-" : idealGain.replace(" kg/week", "") + " kg/week";
document.getElementById("summaryCalories").cells[1].innerText = calories === 0 ? "-" : calories + " kcal";
}
function updateChart(currentWeight, estAdultWeight, currentAgeMonths, isPuppy) {
if (!ctx) {
var canvas = document.getElementById('growthChart');
if (canvas) {
ctx = canvas.getContext('2d');
} else {
console.error("Canvas element not found!");
return;
}
}
if (!isPuppy) {
clearChart();
if (ctx) ctx.canvas.style.display = 'none'; // Hide chart if not puppy
document.querySelector('.chart-container h3').innerText = "Growth Chart Unavailable (Adult Dog)";
return;
} else {
if (ctx) ctx.canvas.style.display = 'block'; // Show chart if puppy
document.querySelector('.chart-container h3').innerText = "Growth Projection (Puppy Stage)";
}
var chartData = {
labels: [],
datasets: [
{
label: 'Current Weight',
data: [],
borderColor: 'rgb(75, 192, 192)',
backgroundColor: 'rgba(75, 192, 192, 0.2)',
fill: false,
tension: 0.1,
pointRadius: 5,
pointHoverRadius: 7
},
{
label: 'Estimated Adult Weight',
data: [],
borderColor: 'rgb(255, 99, 132)',
backgroundColor: 'rgba(255, 99, 132, 0.2)',
fill: false,
tension: 0.1,
pointStyle: 'dash',
pointRadius: 4,
pointHoverRadius: 6
}
]
};
// Generate data points for the growth curve up to estimated adult weight or 18 months
var maxAgeMonths = 18; // Project up to 18 months
var monthsToAdult = Math.max(0, 12 – currentAgeMonths / 12 * 52 / 4.33); // Rough estimate in months
var projectedWeeksToAdult = Math.max(1, Math.round(monthsToAdult * 4.33)); // In weeks
var currentAgeWeeks = currentAgeMonths / 12 * 52;
if (estAdultWeight <= currentWeight) { // Handle case where est adult is already reached or surpassed
estAdultWeight = currentWeight * 1.1; // Project slightly higher
}
var weeklyIncrement = (estAdultWeight – currentWeight) / projectedWeeksToAdult;
var currentProjectedWeight = currentWeight;
for (var week = 0; week <= projectedWeeksToAdult; week++) {
var ageInWeeks = currentAgeWeeks + week;
var ageInMonthsLabel = Math.round(ageInWeeks / 4.33); // Approximate months for label
var label = ageInMonthsLabel + "m";
// Calculate projected weight
currentProjectedWeight = currentWeight + (weeklyIncrement * week);
// Ensure projected weight doesn't exceed estimated adult weight drastically if time is off
currentProjectedWeight = Math.min(currentProjectedWeight, estAdultWeight + (estAdultWeight * 0.1)); // Allow slight overshoot
chartData.labels.push(label);
chartData.datasets[0].data.push(currentProjectedWeight); // Projecting current weight forward
chartData.datasets[1].data.push(estAdultWeight); // Target adult weight line
}
// Ensure current age and weight are plotted
chartData.labels.unshift("Now");
chartData.datasets[0].data.unshift(currentWeight);
chartData.datasets[1].data.unshift(estAdultWeight);
// Remove duplicate labels if any, and adjust data points accordingly
var uniqueLabels = [];
var uniqueDataCurrent = [];
var uniqueDataAdult = [];
var labelMap = {}; // To store index for adult weight matching
for (var i = 0; i < chartData.labels.length; i++) {
var label = chartData.labels[i];
if (!labelMap[label]) {
labelMap[label] = uniqueLabels.length;
uniqueLabels.push(label);
uniqueDataCurrent.push(chartData.datasets[0].data[i]);
uniqueDataAdult.push(chartData.datasets[1].data[i]);
} else {
// If label is duplicate, update the adult weight to the last value for that label
uniqueDataAdult[labelMap[label]] = chartData.datasets[1].data[i];
}
}
chartData.labels = uniqueLabels;
chartData.datasets[0].data = uniqueDataCurrent;
chartData.datasets[1].data = uniqueDataAdult;
if (growthChart) {
growthChart.destroy();
}
growthChart = new Chart(ctx, {
type: 'line',
data: chartData,
options: {
responsive: true,
maintainAspectRatio: false,
scales: {
x: {
title: {
display: true,
text: 'Age (Months)'
}
},
y: {
title: {
display: true,
text: 'Weight (kg)'
},
beginAtZero: true
}
},
plugins: {
legend: {
display: true,
position: 'top',
},
title: {
display: true,
text: 'Weight Growth Projection'
}
}
}
});
}
function clearChart() {
if (growthChart) {
growthChart.destroy();
growthChart = null;
}
if (ctx) {
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
}
}
function resetCalculator() {
document.getElementById("breed").value = "";
document.getElementById("currentAgeMonths").value = "6";
document.getElementById("currentWeightKg").value = "15";
document.getElementById("estimatedAdultWeightKg").value = "25";
document.getElementById("gender").value = "male";
document.getElementById("activityLevel").value = "medium";
// Clear errors
showError("breedError", "", false);
showError("currentAgeMonthsError", "", false);
showError("currentWeightKgError", "", false);
showError("estimatedAdultWeightKgError", "", false);
// Clear results
document.getElementById("primaryResult").innerText = "Enter details to see results";
document.getElementById("weightStatus").innerText = "Weight Status: -";
document.getElementById("growthStage").innerText = "Growth Stage: -";
document.getElementById("idealWeeklyGain").innerText = "Ideal Weekly Gain: -";
document.getElementById("calorieNeeds").innerText = "Estimated Daily Calorie Needs: – kcal";
updateTable("-", "-", "-", "-", "-", "-", "-", "-", "-", "-");
clearChart();
}
function copyResults() {
var primaryResult = document.getElementById("primaryResult").innerText;
var weightStatus = document.getElementById("weightStatus").innerText;
var growthStage = document.getElementById("growthStage").innerText;
var idealWeeklyGain = document.getElementById("idealWeeklyGain").innerText;
var calorieNeeds = document.getElementById("calorieNeeds").innerText;
var breed = document.getElementById("breed").value.trim() || "N/A";
var age = document.getElementById("currentAgeMonths").value + " Months" || "N/A";
var currentWeight = document.getElementById("currentWeightKg").value + " kg" || "N/A";
var estAdultWeight = document.getElementById("estimatedAdultWeightKg").value + " kg" || "N/A";
var gender = document.getElementById("gender").value || "N/A";
var activity = document.getElementById("activityLevel").value || "N/A";
var copyText = "— Dog Weight Calculation Results —\n\n";
copyText += "Primary Result: " + primaryResult + "\n";
copyText += weightStatus + "\n";
copyText += growthStage + "\n";
copyText += idealWeeklyGain + "\n";
copyText += calorieNeeds + "\n\n";
copyText += "— Input Assumptions —\n";
copyText += "Breed: " + breed + "\n";
copyText += "Age: " + age + "\n";
copyText += "Current Weight: " + currentWeight + "\n";
copyText += "Estimated Adult Weight: " + estAdultWeight + "\n";
copyText += "Gender: " + gender.charAt(0).toUpperCase() + gender.slice(1) + "\n";
copyText += "Activity Level: " + activity.charAt(0).toUpperCase() + activity.slice(1) + "\n";
var textArea = document.createElement("textarea");
textArea.value = copyText;
textArea.style.position = "fixed";
textArea.style.top = "0";
textArea.style.left = "0";
textArea.style.opacity = "0";
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'Results copied to clipboard!' : 'Failed to copy results.';
alert(msg); // Simple feedback
} catch (err) {
alert('Oops, unable to copy');
}
document.body.removeChild(textArea);
}
// FAQ Toggle Functionality
function toggleFaq(element) {
var faqItem = element.closest('.faq-item');
faqItem.classList.toggle('open');
var answer = faqItem.querySelector('.faq-answer');
if (faqItem.classList.contains('open')) {
answer.style.display = 'block';
} else {
answer.style.display = 'none';
}
}
// Initialize the calculator on page load
window.onload = function() {
// Attempt to load Chart.js if available (though we are using native Canvas API here)
// Ensure the canvas element is ready
var canvas = document.getElementById('growthChart');
if (canvas) {
ctx = canvas.getContext('2d');
// Initial calculation with default values
calculateDogWeight();
} else {
console.error("Canvas element 'growthChart' not found on load.");
}
};