Track your dog’s heat cycle & fertility window with our free calculator. Know when your female dog will go into heat next – perfect for breeding or prevention.

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How to Use the Dog Heat Cycle Calculator

1. Enter the Last Heat Start Date
   • Select the date when your dog’s last heat cycle began (day you first noticed bleeding/swelling).
2. Select Average Cycle Length
   • Choose from the dropdown:
     • 6 months (most dogs)
     • 5 months (small breeds)
     • 7 months (large breeds)
     • Custom (if you know your dog’s exact cycle)
3. Click “Calculate”
   • The tool will instantly predict:
     • Next expected heat date
     • Most fertile window (best for breeding)
4. Review the Results & Advice
   • Get tailored tips for managing your dog’s heat cycle.

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Why This Tool Is Helpful

✅ Accurate Predictions: Estimates fertility windows for breeding or prevention.
✅ Breed-Specific: Accounts for differences in small/large dogs.
✅ Multi-Language: Use it in English, Spanish, Arabic, and more.

Tip: Bookmark this page to track future cycles!

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Example

If your dog’s last heat started on March 1, the calculator will show:

• Next Heat: ~September 1 (for a 6-month cycle)
• Fertile Days: September 10–15 (ideal for breeding)

📋 How to Use the Dog Heat Cycle Calculator

🔢 Step-by-Step Instructions

1. 📅 Enter the Last Heat Date
   • Example: If your dog started bleeding on March 15, select that date.
   • Pro Tip: Check your vet records if unsure!
2. 🐕 Select Your Dog’s Breed Size
   • Small breeds (e.g., Chihuahua): *5-month cycle*
   • Medium/Large breeds (e.g., Labrador): *6-month cycle*
   • Giant breeds (e.g., Great Dane): *7–8-month cycle*
3. 🖱️ Click “Calculate”
   • Instantly see:
     • Next heat date (when to expect symptoms)
     • Fertile window (days 9–14 of heat for breeding)
4. 📝 Save or Print Results
   • Use the dates to plan vet visits, breeding, or prevent pregnancy.

🐶 Dog Heat Cycle Calculator – Frequently Asked Questions

❓ How accurate is this calculator?

The tool provides estimates based on average canine heat cycles (every 5-8 months). Accuracy improves if you:
✓ Track multiple cycles
✓ Input exact past dates
✓ Select the correct breed size

❓ My dog’s cycle doesn’t match the results. Why?

Dogs vary! Factors like age, health, or breed (e.g., Basenjis cycle annually) can affect timing. Consult your vet if cycles are irregular.

❓ When is a dog most fertile?

During days 9–14 of the heat cycle (when bleeding lightens). This calculator highlights that window for breeding or separation.

❓ Can I use this for first-time heat cycles?

No. Dogs typically have their first heat at 6–24 months old (varies by size). Wait until after the first cycle to use this tool.

❓ How long do heat cycles last?

Usually 2–4 weeks. Symptoms include:

• Swollen vulva
• Bloody discharge
• Increased urination

❓ Can I prevent pregnancy after the fertile window?

No. Keep unneutered males away for the entire heat cycle (up to 4 weeks) to avoid accidental breeding.

❓ Why does breed size matter?

Small dogs (e.g., Chihuahuas) often cycle every 5 months, while giant breeds (e.g., Mastiffs) may cycle every 8–12 months.

❓ Should I track my dog’s cycles?

Yes! Helps:
✔️ Plan vet visits (e.g., spaying)
✔️ Prevent unwanted litters
✔️ Detect health issues (e.g., missed cycles)