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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.
The following symptoms are also sometimes present: 1  Dog itchy skin (most common symptom for a dog with a dog food allergy) 2  Chronic or recurrent dog ear infection. 3  Hair loss.  Excessive 1  scratching. Hot spots.  Dog skin infections (that respond to antibiotics but reoccur after they are 1  discontinued) Frequent bowel movements.