Our cat has developed a skin allergy recently, & we're unsure of the cause. The vet has put him on prednisolone, which he has been on for 2 weeks now, he's been down to half a tablet a day this week, & the allergy started to reappear yesterday. We took him back to the vets today & she recommended we put him on Hill's ZD for 6 weeks, which we're not really keen on because he's so fussy, and a change of food would probably be a bad idea. He has Felix fish & meat trays, & he came up in a huge rash the other day after having tuna, so we're thinking of switching him to the meat selection, rather than the Hill's ZD. Are we doing the right thing?