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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.
Certain reactions and symptoms are normal: 1  Groggy, sleepy, or agitated on the first day. 2  A small amount of blood around the surgery site for the first day and a small amount of swelling and redness for a week. If your dog was in heat, she may have discharge for a couple days. 3  A green tattoo marking her as spayed.