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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 cycles vary but average two to three weeks for most dogs. The heat cycle begins with the first signs of vulvar swelling or vaginal discharge. It ends when all discharge ceases and the vulva has returned to its normal size. There are two methods to prevent estrus, or heat, in a female dog: