I am sorry to hear about this concern.
Absolutely, this is a common presentation for pets that have either a primary allergy issue (environmental or food) and especially for pets with a ear infection (otitis externa). Even if the outer ear canals look clean, that doesn't account for any infection present in the deeper part of the ear canal.
Well worth getting Max into the vet, as this cannot be treated without some type of evaluation and appropriate medication.
Generally, pretty easy to deal with...
Most vets, if an infection is suspected, will take a little smear to see if its bacterial, yeast, or both. This helps to dictate what medication is needed.
In addition, an antihistamine can help a bit to settle him.
Benadryl can be given at a dose of 1mg per pound of body weight. Keep in mind, Benadryl tablets and liquids come in different sizes. So, an approximately 25 pound dog can get a full 25mg tablet or a half of a 50mg tablet. I usually avoid the liquid Benadryl in larger dogs (you would have to give too much of it). You can give Benadryl every 8-12 hours
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