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What are the stages of a dog in heat?

  • The heat, or canine estrus, cycle has four stages; proestrus, estrus, metestrus and anestrus. Male dogs are attracted to the female during the proestrus stage, but the female isn't receptive until the estrus stage, when bleeding occurs.
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There's a relatively small window when your dog is most fertile during the heat cycle; it may begin about nine or ten days after she goes into heat and lasts about five days. However, she can become pregnant until the end of the cycle.

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