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Dog Heat Cycle Calculator

Most female dogs come into heat about every 6 months; small dogs a bit more often, giant breeds less often.

First day of the last (or current) heat Adult size

Fill in the fields above to see the result.

Common questions

How long does a dog stay in heat?

Usually 2–3 weeks, from the first swelling and bleeding until she no longer accepts males.

How often do dogs go into heat?

About twice a year, every 4–12 months depending on size and the individual dog.

Can a dog be spayed during heat?

Many vets prefer to wait 2–3 months after a heat because of bleeding risk. Ask your vet.