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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.
Most dogs go into heat 2 times a year, but it is common to skip one on occasion. While in heat she will be able to breed with more than the one male. She will be in heat for 3 weeks and her cycle will arrive every 6-9 months. The first thing you will recognize when your dog goes into heat is a swollen vulva and bloody discharge. Eggs are not released yet in this phase of her heat cycle.