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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.
Some of the common symptoms that you are likely to notice when your dog is approaching the end include excessively runny eyes, a lack of interest in eating, loss of control of the internal organs such as the bladder and bowels and a considerable drop in the temperature of the body.