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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 standard pattern for heat cycles in dogs is about every six months, but there is tremendous variation among breeds and individuals. Basenjis tend to have one heat per year. Some bitches will cycle every seven months and some every 13 months.