#dog-heat-cycle-calculator {
max-width: 700px;
margin: 20px auto;
padding: 20px;
background: #ffffff;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
font-family: -apple-system, BlinkMacSystemFont, ‘Arial’, sans-serif;
color: #333333;
box-sizing: border-box;
line-height: 1.5;
}
h2 {
text-align: center;
margin: 0 0 15px;
font-size: 1.5rem;
font-weight: 600;
color: #222222;
}
p {
text-align: center;
color: #666666;
font-size: 0.9rem;
margin-bottom: 20px;
}
.form-group {
margin-bottom: 20px;
position: relative;
}
label {
display: block;
margin-bottom: 6px;
font-size: 0.9rem;
font-weight: 600;
color: #333333;
}
input[type=”date”], input[type=”number”], #breed-input {
width: 100%;
padding: 10px;
border: 1px solid #dddddd;
border-radius: 4px;
font-size: 0.9rem;
box-sizing: border-box;
transition: border-color 0.3s;
}
input:focus, #breed-input:focus {
border-color: #0073aa;
outline: none;
}
.autocomplete-list {
position: absolute;
width: 100%;
max-height: 150px;
overflow-y: auto;
background: #ffffff;
border: 1px solid #dddddd;
border-radius: 4px;
z-index: 10;
margin-top: 2px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.autocomplete-item {
padding: 8px;
font-size: 0.9rem;
cursor: pointer;
}
.autocomplete-item:hover {
background: #f0f0f0;
}
.tooltip {
position: relative;
display: inline-block;
margin-left: 5px;
cursor: help;
}
.tooltip .tooltip-text {
visibility: hidden;
width: 200px;
background: #333333;
color: #ffffff;
text-align: center;
border-radius: 4px;
padding: 6px;
position: absolute;
z-index: 10;
bottom: 125%;
left: 50%;
transform: translateX(-50%);
opacity: 0;
transition: opacity 0.3s;
font-size: 0.75rem;
}
.tooltip:hover .tooltip-text {
visibility: visible;
opacity: 1;
}
.button-group {
display: flex;
gap: 12px;
justify-content: center;
margin: 20px 0;
}
button {
padding: 10px 20px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 0.9rem;
font-weight: 500;
transition: background 0.3s;
}
#calculate-btn {
background: #0073aa;
color: #ffffff;
}
#calculate-btn:hover {
background: #005177;
}
#reset-btn {
background: #6c757d;
color: #ffffff;
}
#reset-btn:hover {
background: #5a6268;
}
#copy-btn {
background: #28a745;
color: #ffffff;
}
#copy-btn:hover {
background: #218838;
}
#result {
margin-top: 20px;
padding: 15px;
border-radius: 4px;
font-size: 0.9rem;
line-height: 1.6;
min-height: 30px;
}
#result.success {
background: #e6f4ea;
border: 1px solid #28a745;
}
#result.error {
background: #f8d7da;
border: 1px solid #dc3545;
}
.health-tips {
margin-top: 15px;
font-size: 0.85rem;
}
.health-tips ul {
padding-left: 20px;
}
noscript {
display: block;
color: #dc3545;
text-align: center;
margin-top: 15px;
font-size: 0.9rem;
}
@media (max-width: 600px) {
#dog-heat-cycle-calculator {
margin: 10px;
padding: 15px;
}
h2 {
font-size: 1.3rem;
}
.button-group {
flex-direction: column;
}
button {
width: 100%;
}
}
Typical Cycle Length: ${effectiveCycleLength} days (~${Math.round(effectiveCycleLength / 30)} months)
Last Heat Start: ${formatDate(proestrusStart)}
Current Phase: ${currentPhase} – ${currentDescription}
Phase Timeline:
– Proestrus: ${formatDate(proestrusStart)} to ${formatDate(proestrusEnd)} (${phases.proestrus.description})
– Estrus: ${formatDate(estrusStart)} to ${formatDate(estrusEnd)} (${phases.estrus.description})
– Diestrus: ${formatDate(diestrusStart)} to ${formatDate(diestrusEnd)} (${phases.diestrus.description})
– Anestrus: ${formatDate(anestrusStart)} to ${formatDate(nextCycleStart)} (${phases.anestrus.description})
Fertility Window: ${formatDate(estrusStart)} to ${formatDate(estrusEnd)}
Next Expected Heat: ${formatDate(nextCycleStart)}
Dog Heat Cycle Calculator
Track your dog’s heat cycle to manage breeding or health. Consult a vet for spaying or breeding decisions.
Enter your dog’s breed and last heat date, then click “Calculate”.
JavaScript is disabled. Please enable it to use the calculator.
(function() {
if (!document.getElementById(‘dog-heat-cycle-calculator’)) return;
const form = document.getElementById(‘calc-form’);
const breedInput = document.getElementById(‘breed-input’);
const breedValue = document.getElementById(‘breed-value’);
const autocompleteList = document.getElementById(‘autocomplete-list’);
const lastHeatDate = document.getElementById(‘last-heat-date’);
const cycleLengthInput = document.getElementById(‘cycle-length’);
const resultDiv = document.getElementById(‘result’);
const breeds = [
{ name: ‘Affenpinscher’, cycleLength: 180, size: ‘small’ },
{ name: ‘Afghan Hound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Airedale Terrier’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Akita’, cycleLength: 180, size: ‘large’ },
{ name: ‘Alaskan Malamute’, cycleLength: 180, size: ‘large’ },
{ name: ‘American Bulldog’, cycleLength: 180, size: ‘large’ },
{ name: ‘American Eskimo Dog’, cycleLength: 180, size: ‘small’ },
{ name: ‘American Foxhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘American Hairless Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘American Staffordshire Terrier’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Anatolian Shepherd Dog’, cycleLength: 180, size: ‘large’ },
{ name: ‘Appenzeller Sennenhund’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Australian Cattle Dog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Australian Shepherd’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Australian Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Azawakh’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Barbet’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Basenji’, cycleLength: 360, size: ‘small’ }, // Basenjis typically cycle once a year
{ name: ‘Basset Hound’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Beagle’, cycleLength: 180, size: ‘small’ },
{ name: ‘Bearded Collie’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Beauceron’, cycleLength: 180, size: ‘large’ },
{ name: ‘Bedlington Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Belgian Laekenois’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Belgian Malinois’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Belgian Sheepdog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Belgian Tervuren’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Bergamasco Sheepdog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Berger Picard’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Bernese Mountain Dog’, cycleLength: 180, size: ‘large’ },
{ name: ‘Bichon Frise’, cycleLength: 180, size: ‘small’ },
{ name: ‘Black and Tan Coonhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Black Russian Terrier’, cycleLength: 180, size: ‘large’ },
{ name: ‘Bloodhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Bluetick Coonhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Boerboel’, cycleLength: 180, size: ‘large’ },
{ name: ‘Border Collie’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Border Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Borzoi’, cycleLength: 180, size: ‘large’ },
{ name: ‘Boston Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Bouvier des Flandres’, cycleLength: 180, size: ‘large’ },
{ name: ‘Boxer’, cycleLength: 180, size: ‘large’ },
{ name: ‘Boykin Spaniel’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Bracco Italiano’, cycleLength: 180, size: ‘large’ },
{ name: ‘Briard’, cycleLength: 180, size: ‘large’ },
{ name: ‘Brittany’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Brussels Griffon’, cycleLength: 180, size: ‘small’ },
{ name: ‘Bull Terrier’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Bulldog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Bullmastiff’, cycleLength: 180, size: ‘large’ },
{ name: ‘Cairn Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Canaan Dog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Cane Corso’, cycleLength: 180, size: ‘large’ },
{ name: ‘Cardigan Welsh Corgi’, cycleLength: 180, size: ‘small’ },
{ name: ‘Cavalier King Charles Spaniel’, cycleLength: 180, size: ‘small’ },
{ name: ‘Cesky Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Chesapeake Bay Retriever’, cycleLength: 180, size: ‘large’ },
{ name: ‘Chihuahua’, cycleLength: 180, size: ‘small’ },
{ name: ‘Chinese Crested’, cycleLength: 180, size: ‘small’ },
{ name: ‘Chinese Shar-Pei’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Chow Chow’, cycleLength: 180, size: ‘large’ },
{ name: ‘Clumber Spaniel’, cycleLength: 180, size: ‘large’ },
{ name: ‘Cocker Spaniel’, cycleLength: 180, size: ‘small’ },
{ name: ‘Collie’, cycleLength: 180, size: ‘large’ },
{ name: ‘Coton de Tulear’, cycleLength: 180, size: ‘small’ },
{ name: ‘Curly-Coated Retriever’, cycleLength: 180, size: ‘large’ },
{ name: ‘Dachshund’, cycleLength: 180, size: ‘small’ },
{ name: ‘Dalmatian’, cycleLength: 180, size: ‘large’ },
{ name: ‘Dandie Dinmont Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Danish-Swedish Farmdog’, cycleLength: 180, size: ‘small’ },
{ name: ‘Doberman Pinscher’, cycleLength: 180, size: ‘large’ },
{ name: ‘Dogue de Bordeaux’, cycleLength: 180, size: ‘large’ },
{ name: ‘English Cocker Spaniel’, cycleLength: 180, size: ‘medium’ },
{ name: ‘English Foxhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘English Setter’, cycleLength: 180, size: ‘large’ },
{ name: ‘English Springer Spaniel’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Entlebucher Mountain Dog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Field Spaniel’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Finnish Lapphund’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Finnish Spitz’, cycleLength: 180, size: ‘small’ },
{ name: ‘Flat-Coated Retriever’, cycleLength: 180, size: ‘large’ },
{ name: ‘French Bulldog’, cycleLength: 180, size: ‘small’ },
{ name: ‘German Pinscher’, cycleLength: 180, size: ‘medium’ },
{ name: ‘German Shepherd Dog’, cycleLength: 180, size: ‘large’ },
{ name: ‘German Shorthaired Pointer’, cycleLength: 180, size: ‘large’ },
{ name: ‘German Wirehaired Pointer’, cycleLength: 180, size: ‘large’ },
{ name: ‘Giant Schnauzer’, cycleLength: 180, size: ‘large’ },
{ name: ‘Glen of Imaal Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Golden Retriever’, cycleLength: 180, size: ‘large’ },
{ name: ‘Gordon Setter’, cycleLength: 180, size: ‘large’ },
{ name: ‘Grand Basset Griffon Vendéen’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Great Dane’, cycleLength: 180, size: ‘large’ },
{ name: ‘Great Pyrenees’, cycleLength: 180, size: ‘large’ },
{ name: ‘Greater Swiss Mountain Dog’, cycleLength: 180, size: ‘large’ },
{ name: ‘Greyhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Harrier’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Havanese’, cycleLength: 180, size: ‘small’ },
{ name: ‘Ibizan Hound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Icelandic Sheepdog’, cycleLength: 180, size: ‘small’ },
{ name: ‘Irish Red and White Setter’, cycleLength: 180, size: ‘large’ },
{ name: ‘Irish Setter’, cycleLength: 180, size: ‘large’ },
{ name: ‘Irish Terrier’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Irish Water Spaniel’, cycleLength: 180, size: ‘large’ },
{ name: ‘Irish Wolfhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Italian Greyhound’, cycleLength: 180, size: ‘small’ },
{ name: ‘Japanese Chin’, cycleLength: 180, size: ‘small’ },
{ name: ‘Keeshond’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Kerry Blue Terrier’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Komondor’, cycleLength: 180, size: ‘large’ },
{ name: ‘Kuvasz’, cycleLength: 180, size: ‘large’ },
{ name: ‘Labrador Retriever’, cycleLength: 180, size: ‘large’ },
{ name: ‘Lagotto Romagnolo’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Lakeland Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Lancashire Heeler’, cycleLength: 180, size: ‘small’ },
{ name: ‘Leonberger’, cycleLength: 180, size: ‘large’ },
{ name: ‘Lhasa Apso’, cycleLength: 180, size: ‘small’ },
{ name: ‘Lowchen’, cycleLength: 180, size: ‘small’ },
{ name: ‘Maltese’, cycleLength: 180, size: ‘small’ },
{ name: ‘Manchester Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Mastiff’, cycleLength: 180, size: ‘large’ },
{ name: ‘Miniature American Shepherd’, cycleLength: 180, size: ‘small’ },
{ name: ‘Miniature Bull Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Miniature Pinscher’, cycleLength: 180, size: ‘small’ },
{ name: ‘Miniature Schnauzer’, cycleLength: 180, size: ‘small’ },
{ name: ‘Mixed/Other’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Mudi’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Neapolitan Mastiff’, cycleLength: 180, size: ‘large’ },
{ name: ‘Newfoundland’, cycleLength: 180, size: ‘large’ },
{ name: ‘Norfolk Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Norwegian Buhund’, cycleLength: 180, size: ‘small’ },
{ name: ‘Norwegian Elkhound’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Norwegian Lundehund’, cycleLength: 180, size: ‘small’ },
{ name: ‘Norwich Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Nova Scotia Duck Tolling Retriever’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Old English Sheepdog’, cycleLength: 180, size: ‘large’ },
{ name: ‘Otterhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Papillon’, cycleLength: 180, size: ‘small’ },
{ name: ‘Parson Russell Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Pekingese’, cycleLength: 180, size: ‘small’ },
{ name: ‘Pembroke Welsh Corgi’, cycleLength: 180, size: ‘small’ },
{ name: ‘Petit Basset Griffon Vendéen’, cycleLength: 180, size: ‘small’ },
{ name: ‘Pharaoh Hound’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Plott Hound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Pointer’, cycleLength: 180, size: ‘large’ },
{ name: ‘Polish Lowland Sheepdog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Pomeranian’, cycleLength: 180, size: ‘small’ },
{ name: ‘Poodle’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Portuguese Podengo Pequeno’, cycleLength: 180, size: ‘small’ },
{ name: ‘Portuguese Water Dog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Pug’, cycleLength: 180, size: ‘small’ },
{ name: ‘Puli’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Pumi’, cycleLength: 180, size: ‘small’ },
{ name: ‘Pyrenean Mastiff’, cycleLength: 180, size: ‘large’ },
{ name: ‘Pyrenean Shepherd’, cycleLength: 180, size: ‘small’ },
{ name: ‘Rat Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Redbone Coonhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Rhodesian Ridgeback’, cycleLength: 180, size: ‘large’ },
{ name: ‘Rottweiler’, cycleLength: 180, size: ‘large’ },
{ name: ‘Russell Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Saint Bernard’, cycleLength: 180, size: ‘large’ },
{ name: ‘Saluki’, cycleLength: 180, size: ‘large’ },
{ name: ‘Samoyed’, cycleLength: 180, size: ‘large’ },
{ name: ‘Schipperke’, cycleLength: 180, size: ‘small’ },
{ name: ‘Scottish Deerhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Scottish Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Sealyham Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Shetland Sheepdog’, cycleLength: 180, size: ‘small’ },
{ name: ‘Shiba Inu’, cycleLength: 180, size: ‘small’ },
{ name: ‘Shih Tzu’, cycleLength: 180, size: ‘small’ },
{ name: ‘Siberian Husky’, cycleLength: 180, size: ‘large’ },
{ name: ‘Silky Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Skye Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Sloughi’, cycleLength: 180, size: ‘large’ },
{ name: ‘Smooth Fox Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Soft Coated Wheaten Terrier’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Spanish Water Dog’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Spinone Italiano’, cycleLength: 180, size: ‘large’ },
{ name: ‘Staffordshire Bull Terrier’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Standard Schnauzer’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Sussex Spaniel’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Swedish Vallhund’, cycleLength: 180, size: ‘small’ },
{ name: ‘Tibetan Mastiff’, cycleLength: 180, size: ‘large’ },
{ name: ‘Tibetan Spaniel’, cycleLength: 180, size: ‘small’ },
{ name: ‘Tibetan Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Toy Fox Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Treeing Walker Coonhound’, cycleLength: 180, size: ‘large’ },
{ name: ‘Vizsla’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Weimaraner’, cycleLength: 180, size: ‘large’ },
{ name: ‘Welsh Springer Spaniel’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Welsh Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘West Highland White Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Whippet’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Wire Fox Terrier’, cycleLength: 180, size: ‘small’ },
{ name: ‘Wirehaired Pointing Griffon’, cycleLength: 180, size: ‘large’ },
{ name: ‘Wirehaired Vizsla’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Xoloitzcuintli’, cycleLength: 180, size: ‘medium’ },
{ name: ‘Yorkshire Terrier’, cycleLength: 180, size: ‘small’ }
];
function populateAutocomplete(query = ”) {
autocompleteList.innerHTML = ”;
const filteredBreeds = breeds.filter(b => b.name.toLowerCase().includes(query.toLowerCase()));
filteredBreeds.forEach(breed => {
const item = document.createElement(‘div’);
item.className = ‘autocomplete-item’;
item.textContent = breed.name;
item.setAttribute(‘role’, ‘option’);
item.addEventListener(‘click’, () => {
breedInput.value = breed.name;
breedValue.value = breed.name;
autocompleteList.innerHTML = ”;
});
autocompleteList.appendChild(item);
});
}
breedInput.addEventListener(‘input’, () => {
populateAutocomplete(breedInput.value);
});
breedInput.addEventListener(‘focus’, () => {
populateAutocomplete(breedInput.value);
});
document.addEventListener(‘click’, (e) => {
if (!breedInput.contains(e.target) && !autocompleteList.contains(e.target)) {
autocompleteList.innerHTML = ”;
}
});
function formatDate(date) {
return date.toLocaleDateString(‘en-US’, { year: ‘numeric’, month: ‘long’, day: ‘numeric’ });
}
function addDays(date, days) {
const result = new Date(date);
result.setDate(result.getDate() + days);
return result;
}
function calculate() {
resultDiv.className = ”;
resultDiv.innerHTML = ”;
try {
const breedName = breedValue.value || breedInput.value;
const lastHeat = lastHeatDate.value;
const cycleLength = parseInt(cycleLengthInput.value) || null;
if (!breedName) {
throw new Error(‘Please select a breed.’);
}
if (!lastHeat) {
throw new Error(‘Please enter the last heat cycle start date.’);
}
const breed = breeds.find(b => b.name.toLowerCase() === breedName.toLowerCase()) || breeds.find(b => b.name === ‘Mixed/Other’);
const startDate = new Date(lastHeat);
const today = new Date();
if (startDate > today) {
throw new Error(‘Last heat date cannot be in the future.’);
}
// Use provided cycle length or breed default
const effectiveCycleLength = cycleLength || breed.cycleLength;
// Typical heat cycle phases (in days)
const phases = {
proestrus: { duration: 9, description: ‘Bleeding and swelling begin; not yet fertile.’ }, // 7–11 days
estrus: { duration: 9, description: ‘Fertile period; mating most likely to succeed.’ }, // 7–11 days
diestrus: { duration: 60, description: ‘Post-fertile phase; pregnancy or rest period.’ }, // ~60 days
anestrus: { duration: effectiveCycleLength – 78, description: ‘Resting phase until next cycle.’ } // Remaining time
};
// Calculate phase dates
const proestrusStart = startDate;
const proestrusEnd = addDays(proestrusStart, phases.proestrus.duration – 1);
const estrusStart = addDays(proestrusStart, phases.proestrus.duration);
const estrusEnd = addDays(estrusStart, phases.estrus.duration – 1);
const diestrusStart = addDays(estrusStart, phases.estrus.duration);
const diestrusEnd = addDays(diestrusStart, phases.diestrus.duration – 1);
const anestrusStart = addDays(diestrusStart, phases.diestrus.duration);
const nextCycleStart = addDays(proestrusStart, effectiveCycleLength);
// Determine current phase
let currentPhase = ‘Unknown’;
let currentDescription = ”;
if (today >= proestrusStart && today = estrusStart && today = diestrusStart && today = anestrusStart && today = nextCycleStart) {
currentPhase = ‘Possible New Cycle’;
currentDescription = ‘Your dog may have started a new heat cycle.’;
}
// Management tips based on size
let tips;
if (breed.size === ‘small’) {
tips = [
‘Small breeds may have shorter, more frequent cycles.’,
‘Monitor closely for signs like swelling or discharge.’,
‘Use doggy diapers to manage mess during proestrus.’,
‘Consult a vet if cycles seem irregular.’
];
} else if (breed.size === ‘medium’) {
tips = [
‘Medium breeds typically cycle every 6 months.’,
‘Keep your dog comfortable with extra bedding.’,
‘Prevent unwanted mating with supervision or barriers.’,
‘Track cycle dates for accurate predictions.’
];
} else {
tips = [
‘Large breeds may have longer recovery phases.’,
‘Provide a calm environment during estrus.’,
‘Watch for prolonged bleeding; consult a vet if over 21 days.’,
‘Consider spaying to avoid health risks.’
];
}
resultDiv.innerHTML = `
Breed: ${breed.name}Typical Cycle Length: ${effectiveCycleLength} days (~${Math.round(effectiveCycleLength / 30)} months)
Last Heat Start: ${formatDate(proestrusStart)}
Current Phase: ${currentPhase} – ${currentDescription}
Phase Timeline:
– Proestrus: ${formatDate(proestrusStart)} to ${formatDate(proestrusEnd)} (${phases.proestrus.description})
– Estrus: ${formatDate(estrusStart)} to ${formatDate(estrusEnd)} (${phases.estrus.description})
– Diestrus: ${formatDate(diestrusStart)} to ${formatDate(diestrusEnd)} (${phases.diestrus.description})
– Anestrus: ${formatDate(anestrusStart)} to ${formatDate(nextCycleStart)} (${phases.anestrus.description})
Fertility Window: ${formatDate(estrusStart)} to ${formatDate(estrusEnd)}
Next Expected Heat: ${formatDate(nextCycleStart)}
Heat Cycle Tips:
`;
resultDiv.className = ‘success’;
document.getElementById(‘copy-btn’).addEventListener(‘click’, () => {
const text = `
Dog Heat Cycle Results
Breed: ${breed.name}
Typical Cycle Length: ${effectiveCycleLength} days (~${Math.round(effectiveCycleLength / 30)} months)
Last Heat Start: ${formatDate(proestrusStart)}
Current Phase: ${currentPhase} – ${currentDescription}
Phase Timeline:
– Proestrus: ${formatDate(proestrusStart)} to ${formatDate(proestrusEnd)} (${phases.proestrus.description})
– Estrus: ${formatDate(estrusStart)} to ${formatDate(estrusEnd)} (${phases.estrus.description})
– Diestrus: ${formatDate(diestrusStart)} to ${formatDate(diestrusEnd)} (${phases.diestrus.description})
– Anestrus: ${formatDate(anestrusStart)} to ${formatDate(nextCycleStart)} (${phases.anestrus.description})
Fertility Window: ${formatDate(estrusStart)} to ${formatDate(estrusEnd)}
Next Expected Heat: ${formatDate(nextCycleStart)}
Heat Cycle Tips:
${tips.map(tip => `- ${tip}`).join(‘\n’)}
`.trim();
navigator.clipboard.writeText(text).then(() => {
alert(‘Results copied to clipboard!’);
});
});
} catch (error) {
resultDiv.innerHTML = `Error: ${error.message}`;
resultDiv.className = ‘error’;
}
}
function reset() {
form.reset();
breedInput.value = ”;
breedValue.value = ”;
autocompleteList.innerHTML = ”;
resultDiv.className = ”;
resultDiv.innerHTML = ‘Enter your dog’s breed and last heat date, then click “Calculate”.’;
breedInput.focus();
}
document.getElementById(‘calculate-btn’).addEventListener(‘click’, calculate);
document.getElementById(‘reset-btn’).addEventListener(‘click’, reset);
form.addEventListener(‘keypress’, (e) => {
if (e.key === ‘Enter’ && e.target.tagName !== ‘BUTTON’) {
e.preventDefault();
calculate();
}
});
})();
-
${tips.map(tip => `
- ${tip} `).join(”)}