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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.
These are all serious signs and the dog must see a veterinarian immediately. This is an EMERGENCY! Even at the earliest stage of heat stroke, you may be fighting for your dog's life. If not treated immediately, these symptoms can be followed in minutes by collapse, seizures, coma, and death. You must get your pup to a veterinarian as soon as possible.