Dog Heat Cycle Calculator
Predict your dog's future estrus periods, peak fertility windows, and potential due dates with 100% precision. Free for all pet lovers.
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Estimated Next Heat
Mastering the Canine Estrus Cycle
How to Use the TrendCart Dog Heat Tool
Using our Dog Heat Cycle Calculator is simple and 100% free. To get the most accurate results, you need to track the first day you notice signs of "proestrus" (bleeding or swelling). Simply input that date, select your breed's size, and our advanced algorithm will generate a 2-year fertility map for your pet.
Why Use TrendCart's Calculator?
- 100% Free Forever: No subscription, no hidden fees, and no limit on how many dogs you can track.
- Privacy Priority: We do not store your dog's data. Everything is calculated locally in your browser for 100% security.
- Advanced Algorithm: Unlike basic tools, we factor in breed-specific cycle lengths (from 4 to 12 months).
Understanding the 4 Stages
To use our 100% free calculator effectively, pet owners must understand what happens during a heat cycle:
Proestrus
Duration: 9 days. Signs: Swelling and bleeding. Males are attracted but females will reject them.
Estrus
Duration: 9 days. This is the mating phase. The female is now fertile and receptive to males.
Diestrus
Duration: 60 days. The phase after heat where the body either maintains pregnancy or returns to normal.
Anestrus
Duration: 4-5 months. The rest phase where no sexual activity or hormones are present.
Frequently Asked Questions (FAQs)
When will my dog's first heat start?
Most dogs experience their first heat between 6 and 12 months. Small breeds start earlier, while giant breeds can take up to 24 months. Our tool is 100% free for all these breeds.
How long does the heat cycle last?
An average heat cycle lasts 2 to 4 weeks. If the cycle lasts longer than 4 weeks or occurs too frequently, consult your vet immediately.
Can my dog get pregnant on her first heat?
Yes, 100%. Even in the first heat, a dog is capable of producing puppies. Proper supervision is mandatory.