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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.
Once it does, the average is about every six months. Smaller breeds may go into heat more frequently, as often as 3-4 times a year. Larger dogs, like Irish Wolfhounds, St. Bernards and Great Danes may only go into heat every 12-18 months.