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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.
The first few days will involve swelling of the girlâs Vulva and a bloody vaginal discharge. The early stages of heat will last up to 9 to 15 days and the female dog may seem miserable and will be resistant to male dogs, even though the male will still be attracted to the female.