"Regarding aspirin, buffered is preferred. Most people tremendously under dose aspirin in dogs to the point where it probably doesn't work as needed. If you are giving a low dose aspirin to anything larger than a 10# dog, you are under dosing."
Assume you can adjust the dose based on the weight of the dog? I use baby aspirin because it's something I take myself (convenient) and my vet says that the company that used to make the buffered product for dogs stopped making it because the demand wasn't large enough. Do you have a specific product your recommend - I know that some of the common product we use as human's are harmful/lethal.