How Long Does a Dogs Heat Last?

Answer

The heat cycle period happens every six months, and it will last for twenty-one days or for about three weeks. And within that time span, there will be only two to three days when she will actually be ready to have her eggs fertilized by sperm.
Reference:
1 Additional Answer
A dog's heat can last from six to twelve days. The first heat usually occurs between six and twelve months of age. Smaller breeds of dogs can start earlier than that. You can find more information here: http://vetmedicine.about.com/od/pregnancybirthindogs/f/k9_estrus.htm
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Most dogs come in heat around the age of 12 to 14 months old. This cycle usually last 3 weeks or 21 days. Every six to eight months this cycle will occur unless she becomes pregnant
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Your dog bleeds during the proestrus stage of its cycle, which typically lasts about seven to 10 days. You might notice that your dog urinates more and its vulva is swollen. If your
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A dogs heat cycle lasts approximately 21 days. This can vary slightly by the breed of dog. A dogs heat cycle usually occurs every six months. ...
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