My six month old golden retriever was hit on the left hind leg by a car about 15 days ago. He wouldn't eat his food originally and I lost the stand off for people food when he began to lose weight. I switched his food from Purina puppy chow to Pedigree and he was happy for one day. Now he's back to turning his nose away, even when fed by hand. He does not like dog gravy. What should I try?