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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.
Confidence votes 5.0K. Female dogs go through a heat cycle, called estrus, on average every six months. However, this varies from animal to animal. She will have proestrus, or a bleeding cycle, before her true heat cycle during which she is very receptive to the advances of male dogs. This heat cycle lasts for several days up to three or four weeks. This heat cycles goes on unless you spay your dog.