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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.
Generally dogs will come into heat twice a year (approximately every 6 months). There are, however some that come in once a year, and some three times. We will also commonly see that the first heat is an incomplete one and the dog returns to a full heat about 1 month later.