I currently have one Wegie (Kjartan) who is almost one year old, the doctor has ordered a special diet for him (sort of: light cat food mixed with regular, not becasue he is overweight but because he gets diarrhea from super high protein and fat foods). On Saturday, however, I go to pick up my other Wegie kitten (Lofdi). Kitten food is exactly what Kjartan does not need, so I need practical advice on how to get Lofdi his kitten food and keep Kjartan out of it. BTW: Kjartan currently gets a 4:5 mix of Royal Canin: Main Coon 31 and Science Diet Adult Light, Lofdi eats (at the breeders and what I have for him) Nutro & Eukanuba mixed.