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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.
How long is a female dog in heat? The first heat cycle occurs when a female dog is between 6 and 24 months old, typically occurring earlier for smaller breed animals. An unspayed female has two heat cycles per year, approximately every six months.