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How long is a dog or cat "in heat" and how long does pregnancy last?

How long is a dog or cat "in heat" and how long does pregnancy last?

Dogs are are in heat for about 21 days, twice a year. Their pregnancy lasts about 63 days. Cats, however, go in and out of heat all year round until they are bred or spayed. Their pregnancy lasts for about 61 days.

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