he hates it

so i got max some nature's variety to try to see if it helped him and he won't eat it. so he's been eating damian's prescription hard food instead (which he doesn't really like either, but i guess he likes it better. i finally gave in and gave him his nutro back and he scarfed it down. oh, he ate around the new stuff, i was mixing them together. now, damian is a sneaky little thing and he knows my habits and he was able to sneak in a taste of some of the new stuff and he loved it, too bad he's not allowed to have it! so what should i do now?

Can you feed them seprately>>>???

they are fed seperatly, max is fed in my room and i shut the door when i feed him. but every now and then damian sneaks in and steals a bite. this morning damian got a taste of the nature's variety because i had to quickly go check on my son and i left the door open and didn't pick it up, i thought damian was outside. turns out he wasn't, and he watches me like a hawk when he knows max is being fed because he likes his food better. he only gets a couple of bites in before i catch him, max makes this chirping noise when damian eats his food or drinks from his water dish.