The best low cost canned dog food I've found for my German Shepherd is the Pet Smart house brand, it's comparable in price to crap like Old Roy, etc, but it looks like good food and the dog loves it. Slightly more expensive, Pedigree canned food also agrees well with him. He gets a standard can of wet with four cups of dry Purina Premium a day. Shepherds have sensitive stomachs, if the food is crap they get instant diaherria. I put a lot of work into finding the best food at the lowest cost, because he goes thru dog food like a drunk goes thru liquor.

I hope your dog makes it, best wishes on his recovery.