My horse vet got out of small animal practice because he was tired of itchy dogs. It’s practically all they see.
I don’t think allergy shots last that long??
The one he gave my dog lasts a month, and that was a month ago. He hasn't itched since he got the shot, and I didn't change his food at all. Everyone told me it was food allergies because his paws were licked raw, but I guess it must have been environmental problems because I am still feeding him out of the same bag of food as when he started itching.