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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.
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.