Do female dogs have estrogen? Here’s What to Expect

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Do female dogs have estrogen?

When Do Female Dogs Get Their Period?

A dog period is appropriately called an estrus cycle. You may have heard some of its more colloquial terms, “dog in heat” or “dog in season“.

Female dogs usually reach their sexual maturity when they are at six months old, and this is when they have their first “heat.” Smaller breeds may even reach their maturity earlier, while larger breeds may take a year or more.

Do female dogs have estrogen?

During this season, a dog’s estrogen level will increase by mid-stage, decrease rapidly, and then release eggs from their ovaries. These cycles usually go on for two to four weeks.

On average, female dogs go into heat every six months, but this can still vary, especially during the first cycles. It usually takes around 18 to 24 months for some dogs to develop a regular period.

Smaller dog breeds are more likely to go into heat that generally takes three to four times of full estrus cycle a year. In comparison, larger breeds may only go into heat once a year. Dogs will have persistent periods, but the time between the estrus cycle will increase as your furbaby gets older.


Similar to estrogen, progesterone is produced in the ovaries and placenta. It is responsible for the preparation and maintenance of the uterus during a dog’s pregnancy and alternating the immune system to prevent your furbaby’s body from rejecting the developing puppy in your pet’s cervix.

Do female dogs change after being spayed?