I don't know what is wrong with your dog but I wouldn't rule out allergies. It could very well be allergies, and I do hope for your sake it is. I really don't think anything has to change year to year to develope allergies. My mom had a dog for years with no problems and then out of the blue he had horrible rashes. They did allergy testing and found he was allergic to a lot of things! From bird feathers, to cats, to weeds in her yard! Good luck with this, I hope you find an answer soon.
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