my vet works with me closely, since poor Gannon is also allergic to poultry. He responded to the antibiotics and something for a viral infection, I liquid I had to syringe down his throat... I made sure he had fresh water and food, just not much at any time. He's doing much better and doesnt fall over when he uses the litter. Water is the big factor.. if they are dehydrated, they cant put a line in and their kidneys fail fast.
Good luck, Christine, and to your furry friend too!