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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