How Often Do Dogs Go into Heat?

Answer

On average, a healthy female dog comes into season every six months. However, this can vary, and some female dogs only cycle once a year while others come into season on a quarterly basis. (Male dogs do not go into heat)
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Ask.com Answer for: how often do dogs go into heat
Non-spayed female dogs will go into "heat" or estrus usually twice a year, starting at 6-12 months of age. There are four stages of the canine estrus cycle: proestrus, estrus, metestrus, anestrus.
During proestrus, there will be vaginal bleeding. During estrus, the vulva will be swollen, vaginal discharge is more yellowish, the female will accept males and conception can occur.
Dogs go into heat about once every four to six months. Dogs are similar to humans in that the individual dog might be either more or less often than the average. You can find more information here: http://dogs.lovetoknow.com/wiki/Female_Dog_Heat_Cycle
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