I have a 13 yr old Pom. He has a lot of health issues. We recently had to start giving him fluids under his skin twice a week to help flush his kidneys out better. He has a bad ear infection that he's on antibiotics for. The vets also started him in new food for his kidneys. He ate it for a few days and now has stopped. He won't even eat his old food. Any suggestions as to what we can feed him that won't make his pancreas act up? Is there anything we can add to his food that will make it more appealing to him?