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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 heat cycle for a dog is approximately 3 weeks and since this an an average, some heats are shorter (as little as 7-10 days), others are longer (4 weeks or more). Average times between heat periods is seven months but some dogs can cycle as early as every 4 months, some once a year.hen a dog is in heat, it is usually a three week cycle, going in, in, and going out. The second week is when the female will allow the male dog to breed with her. I have seen female's breed in the last week.