Ah, poor Max!! My Jingles would periodically get a case of the hives...they never did determine the cause, but the vet said that it's not all the uncommon in dogs. Usually treatment with Benadryl does the tricks; at least relieves the itching and discomfort! Has he been exposed to anything "new" lately...food, blanketing, medication, even a new laundry detergent? Hope he feels better very soon!

I just noticed your thread from a couple of days ago...had Max recently been vaccinated? Perhaps his lethargy, vomiting and now the hives is a reaction to something he was given at the vets?? Hoping for a good update!