I have 4 cats 2 of which have a special diet they are on hills cd cat biscuits which to be honest i leave down all the time so they can eat as and when they are hungry the other 2 have this as well its easier than trying to have 2 or 3 different lots of biscuits.The old cat and the younger 1 also like there meat so they are given a pouch in a morning and 1 at night. These 2 also have raw meat which 1 of the persians will eat every now and then but roony is a fussy little monkey and will only eat his biscuits.My youngest cat went on to adult whiskas at 6 months as she prefered to eat the older cats meat to the kitten food and the vet said she would be fine with it.