You feed him food found nowhere in nature, but that tastes reminiscent of things he could eat- birds and mammals.
You could give him divine treats at any time that taste so much better than food it might drive him a little mad wanting more. You do not give them to him on any schedule he can discern.
You can lay a dry powder on the ground which causes him to lose his mind a little and behave differently for a short time should he inhale any of it. Sometimes this is inside of his entertainment for the day, and he becomes your entertainment.
You create illusions on flat surfaces that look like prey or other things, illusions that move and sound like they are real and yet when he touches them he finds only cold, flat walls.
You give him prey he cannot eat, prey that are bright colors and make strange sounds and may look nothing like real prey and yet he is enticed to chase and kill, especially the small, uncatchable red dot.
You sleep in a nest of impossibly soft material, and allow him to share this space to sleep beside you, and even to sleep there when you are gone.
Sometimes you disappear and he can find no way to follow or escape in your absence. You create and destroy openings in solid walls at your convenience.
You speak a language he cannot understand, and sometimes you say garbled words in the language of his children, and so he speaks back to you like a mother does a child in the hopes you will understand him and sometimes you seem to.