How Long Does a Dog Stay in Heat? A heat cycle (also known as an estrous cycle) lasts between three to four weeks.

How Often Do Dogs Go Into Heat?

Do Female Dogs Have Periods? Female dogs have periods once they become sexually mature.

When Should I Expect my Dog’s First Heat? The age of sexual maturity (when dogs begin experiencing the estrous cycle) varies between breeds.

What Should I Do When My Dog Is in Heat?