sorry your yorkie is having these problems.
for the ear infections this is what i would do. check the ears and make sure there is no hair in the canal. if there is, pluck it because this lets the ear canal breath and prevent infections. this should be done on a regular basis.
have your vet take a smear of the ear goo to make sure he is treating it with the correct antibiotics. this could be the problem for it not healing. I like mometamax. its more powerful then otomax and works faster.
I would also switch his food to a higher quality food with no corn or wheat as these are common allergens.
switching antibiotics so much isn't going to help. A culture is the best way to figure out what type of antibiotics to use to battle infections but i'm not sure what the vet would culture (throat or lyme node aspiration?)
i'm just throwing a bunch of ideas out there.
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