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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.
You will probably notice some bloody discharge from the vagina and a swollen vulva when your dog is in heat. You may notice mounting behavior, also. <br /> <br /> The heat period can last from 8 to 30 days with an average of about 20 days.