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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.
Dog Heat Cycle Duration. Female dogs that have not been spayed will go into estrus, more commonly known as âheat,â twice a year (about every six months). The age when a dog will begin this cycle and the dog heat cycle duration varies for different breeds as well as from dog to dog. The experienced breeder can usually tell as soon as the cycle begins, but to the everyday dog owner it may go undetected until around day four when signs become more distinct.