Updated On June 13th, 2017
Pet's info: Dog | Chihuahua | Female | unspayed | 6 months and 12 days old
Answered By Jessica Keay, DVM 130
Veterinarian
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If these just arose out of nowhere I would be concerned they are hives and she is having an allergic reaction. Since they are on her face, I would consider this an emergency, so it would be recommended to take her in to the emergency clinic right away, where they can give her a shot of benadryl and a steroid shot to stop the reaction. In severe cases of allergic reactions the face can continue to swell and the swelling can extend to the airway, becoming life threatening, and we don't want that to happen!
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