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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.
Canine heat cycles last for 3 weeks. The first week is when you will notice blood. As the cycle continues, the bloody discharge will become lighter and lighter in color, until it becomes totally clear. It is usually during the 2nd week that the timing is correct for breeding, if you do choose to breed her.