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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.
Pro-estrus: During this phase, the female dog shows symptoms such as the swelling of the vulva and clear discharge sometimes accompanied by blood and frequent urination. Some of the large dog breeds may not show any external signs and symptoms. The phase typically lasts from 8 to 13 days.