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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.
This is the longest phase of a dog's heat cycle, indeed it ranges from 100-150 days. It appears to be a quiet time for the dog's reproductive organs, however, the dog's pituitary gland an ovaries are in reality getting ready for the next proestrus cycle.