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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.
The average cycle for a female dog in heat happens about once every six months, typically between January and March and again between August and October, beginning when a dog reaches about 6 months old. There are four different stages for the estrus (heat) cycle.