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The symptoms of a dog's first heat are the same as any other heat and include swelling of the vulva and bloody vaginal discharge. Female dogs may urinate more frequently when in heat or develop other behavioral changes. Continue Reading.
Dogs in heat need special care. Estrus or âheatâ is part of the reproductive cycle in female dogs. Dogs come into their first heat between about 6 and 24 months of age, with small breeds coming into heat sooner and large breeds later.Dogs typically have two heats per year, and each lasts about 18-24 days.The first signs of heat are typically a swollen vulva and a bloody vaginal discharge.ogs come into their first heat between about 6 and 24 months of age, with small breeds coming into heat sooner and large breeds later. Dogs typically have two heats per year, and each lasts about 18-24 days. The first signs of heat are typically a swollen vulva and a bloody vaginal discharge.