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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 frequency also varies but the average is six months. Just like humans we can talk about frequency of cycle in extreme cases and so just how often the dog have their cycles vary greatly dog to dog. Meanwhile, the duration or the heat itself can last for 21 days or three weeks, give or take one week.