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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.
This can cause them to suffer more quickly from heat stress. Dogs with heavy coats, heart or respiratory troubles, those who are exercising too much in the heat, as well as overweight, very young, infant, and elderly dogs all need special consideration in the heat and have a greater likelihood of developing heat stroke.