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Anonymous
ANSWERS: 2
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A female dog (bitch) is biestrous and goes into heat typically twice a year. The proestrus is relatively long 5-7 days, while the estrus may last 4-13 days. With a diestrus of 7-10 days a typical cycle lasts about 3 weeks followed by about 150 days of anestrus. copied from :http://en.wikipedia.org/wiki/Estrus_cycle#Dogs
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how long does a dog's pregnancy last
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