To give you an idea of dosage, my dog weighs 28lbs and I give her 500mg
Glucosamine, and 200mg Chondroitin daily. If his
weight is twice hers, or approximately, you can give double that dose.
I'd be wary of giving your dog aspirin, and certainly NEVER Ibuprofen (Advil, or anything like that) If he needs a painkiller, get one prescribed. Later you may be able to get this same drug online at a cheaper price.