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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.
Several other signs accompany excessive panting in dogs, such as cough, discomfort, heart problems, anemia, heat strokes, fainting etc. A panting puppy might be of concern, when it is a perfectly normal response to heat or exercise. A puppy is considered to be panting when the breathing rate is 10x the normal rate.