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A dog's period, normally called, in heat, a female bitch will have her period last about 21 days, around two weeks,but is only noticable around two weeks.
 Female dogs don't have period, they go through a heat cycle,  called estrus, every six months. She will have proestrus, or a  bleeding cycle, before her true heat cycle during which she is very  receptive to the advances of male dogs.