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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.
Symptoms in dogs include. 1  increased thirst. 2  increased urination. 3  increased appetite.  reduced 1  activity. excessive panting.  thin or fragile 1  skin. hair 2  loss. recurrent skin infections.  enlargement of the abdomen, resulting in a potbellied appearance.