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The average estrus cycle in a dog is approximately twenty-one days and this cycle usually occurs every six to seven months. The first cycle will often depend on the size of the dog. Small breeds such, as Chihuahuas or Toy Poodles will come into heat between five and seven months.
Expert: Gina replied 8 years ago. A dogs heat cycle will last for a full 3 weeks..the first week her vulva will swell and she will have a red blood discharge..the second week the red discharge will turn a straw color and the third, the swelling will start to go down and the discharge will start to run clear.xpert: Gina replied 8 years ago. A dogs heat cycle will last for a full 3 weeks..the first week her vulva will swell and she will have a red blood discharge..the second week the red discharge will turn a straw color and the third, the swelling will start to go down and the discharge will start to run clear.