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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.
In dogs, signs of an allergic reaction include: 1  Puffy face (e.g., swelling of the face and body) 2  Hives. 3  Itchiness. Redness of the skin.  Agitation/ 1 restlessness. Feeling hot to the touch.