We took Cali to the vet and she has a deep infection in her lip, probably from a pimple, and she is now on antibiotics! The vet did some skin scrapings to check for mange, and it was negative, so all her scratching is probably just dry skin or an allergy to something. The vet suggested only giving her rubber toys to chew on, as many dogs are allergic to plastics. So far her lip is looking a bit better, and we also have to wash her mouth area daily with hydrogen peroxide.
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