My puppy has started growling (not play growling, proper growling) when I pick her up sometimes, and earlier today tried to bite my face when I did. Then she yelped in pain when I did. Our last trip to the vets she was given a preliminary diagnosis of mites, but can't have any treatment for another 2 weeks because of the timing of her last spot-on treatment. Over the past couple of days she's been growling sometimes when she's picked up, but not all the time. She's an absolutely lovely dog and I'm wondering if it's simply discomfort because she's in pain/irritated?