How Long Is A Chihuahuas Menstruation?


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The canine cycle is usually 7 days coming into heat, 7 days in heat and 7 days going out. The most likely time for successful breeding if you want pups, or accidental if you don't want them is day 12 to day 16. I use this as a rule of thumb for my chihuahuas and Jack Russells. Hope this helps.

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