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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 does a \heat\ cycle or estrus last? Heat cycles vary but average two to three weeks for most dogs. There are two methods to prevent estrus, or heat, in a female dog: There is currently a tremendous amount of research being conducted in this area.