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Most dogs go into heat twice a year. Most common cycling frequency for female dogs is every six months or twice a year. Many dogs have this like a clock set up and are cycling at exactly predictable rate. Many dogs go into heat more frequently. Three times per year is quite a common occurrence and considered normal.
Dogs are usually in heat for 21 days. Female dogs have a cyclic sexuality that is independent of season unlike most animals. As for the male dogs, they do not have any cycles and are always ready for intimacy like most males of any species including human beings. Female dogs have a cycle of six months on average meaning they can be in heat twice a year. The heat cycle has three distinct stages. They include: Proestrus. During this stage, one may notice some bleeding from the vulva of the dog. The bleeding can either be heavy or light.