DEAR DR. FOX: My cat passed away a few weeks ago. She ate canned cat food, mostly the fish kinds, though she would usually just eat the gravy and very little fish. My question is: Did I kill my cat by feeding her beef without slowly transitioning from fish? Most likely, her kidneys could not handle the high protein load from the beef she ate, which lead to uremic poisoning. DEAR DR. FOX: Scott Loss and I mentioned you in our article in Tulsa Pets Magazine, which refuted a prior article that had supported TNR (trap, neuter, release).