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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.
When we say a female dog is in heat, this constitutes the first two phases, proestrus and estrus. During proestrus, which can last from three to 17 days, a female dogâs body produces large amounts of estrogen. In dogs, this is accompanied by the start of bloody vaginal discharge, which is dark red to begin with, and caused in part by excessive hormone and pheromone production.