how long do dogs periods last

Dogs' "periods," commonly referred to as their heat cycles, typically last between 2 to 3 weeks, with some variation depending on the individual dog and breed. The bleeding phase, which is often considered analogous to a period, usually lasts about 7 to 10 days. However, the entire heat cycle, which includes four stages (proestrus, estrus, diestrus, and anestrus), can span about 2 to 4 weeks for the first two main stages when bleeding and fertility signs are apparent. The proestrus phase lasts on average 7 to 10 days, characterized by vulvar swelling and bloody discharge. This is followed by the estrus phase, which averages around 9 days, during which the dog is fertile and receptive to mating, and the discharge becomes less bloody and more watery or pinkish. After these phases, there is a longer diestrus phase where swelling and discharge usually cease, even though hormonal changes continue. Overall, dogs typically have heat cycles about twice a year, with the length and frequency influenced by breed, size, and individual factors.