Thanks everyone. Radar may be either sick or just very tired out from playing too hard. I'm hoping it's the second one. I called my vet hospital to get some advice and since I was able to get him to eat a little bit of canned food, they told me to monitor him. This morning when I went to feed the kittens only Reece and Rory came running. Radar was still sleeping in a cat cube. He seems very lethargic and he wasn't interested in eating any of the dry food. He's usually the first one at the food bowl and he's a little piggie so I knew something must be wrong. After he ate some canned food he went back to the cat cube to sleep again. I know that Finnegan was playing with him a lot yesterday so I'm hoping that his body just needs some extra time to recover. Please send some prayers and positive vibes his way. Thanks in advance.