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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.
Heat exhaustion in dogs can occur when the body temperature becomes elevated above the normal temperature. This varies slightly, according to PetMD.com, but it's generally agreed that temperatures of 103 degrees Fahrenheit and higher are above normal.