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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.
Dogs do not get periods like humans do. Female dogs often bleed when in season. The female dog season lasts anywhere from 1-3 weeks. The symptoms include your dog bleeding, although some dogs are very clean so you may not notice. She might also seem to want to escape the house.