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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.
Dogs will go into heat twice a year with the second Estrus cycle coming 5-6 months after the first. One unique difference between dogs and humans is that if left unspayed the female dog will go into heat her entire life as they do not experience any sort of menopause.