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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.
Cause #5: Cold weather. 1  Symptoms: Cold or windy weather -- especially when combined with the dryness caused by indoor heating systems -- can really take a toll on your dog. If their dry skin is caused by seasonal changes, you will see an onset of symptoms like itching and flaking as the weather begins to turn.