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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.
Female dogs do not have periods per se, but they do go through a regular heat cycle if they have not been spayed, or desexed. The average heat cycle for a dog is anywhere from 1 week to 4 weeks in length.The time between heat periods is usually around seven months but can vary from every 4 months to once a year.  Average times between heat periods is seven months but some dogs  can cycle as early as every 4 months, some once a year.    Lengths of heat cycles and intervals between cycles are different  for each dog but most dogs hit somewhere close to the averages.