Again we feed our cats on as much fresh food as possible ie-white fish with grated cheese/cottage cheese, tuna chunks-with brine drained off and chicken mixed with something or on it's own and Sardines with rice pudding as well as leaving JWB biccies down for them
Our Pure bred moggie Noodles as well as being in his Autumn yrs has a sensitive tum and he has Tuna or white chicken and fish also a bit of raw mince beef/steak does them (Or ours at least) the world of good,plus it's so funny watching them squabble over it and kill a tiny bit of meat
We do very rarely use a pouch of Felix etc but it is rare just because we find a: it makes their poo's ultra smelly and sometimes brand pouches can be to rich and go straight thru them and are not very substantial
I agree with Elena in that certain breeds do have particular dietary needs and some have iron tummy's and will not only eat anything but can live with it too
We find too that fresh food for us works out cheaper or their is literally only pennies in it-plus you know exactly what they're eating as well.