ANSWERS: 4
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No. Once a creature is pregnant, they cannot get "more pregnant" nor "pregnant again" until the baby or babies are delivered. This does not mean that they cannot have sex, which seems to be what your male dog has on his mind.
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I do hope that they teach sex education in your school. This is worrying.
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A dog won't even go into heat if it is pregnant. So no- to the entire question.
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not that i know of
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