I don't know whether to worry about my baby cat. He is about 4 months old. He seems ever so slightly more lethargic...seems to have gained alot of weight rapidly, and has a plug of feces. But he was never all that hyper. He does like to eat (I'm careful about what I feed him though)...and he has never really been much of a groomer. He doesn't seem like he's in any sort of pain or discomfort. He doesn't seem dehydrated at all. I think he's constipated. Is there any sort of change I need to put on his diet? I make sure he has fresh water everyday. I also leave out a good dry food. I can't recall the name. It's not carried in regular grocery stores. It's a purple foil bag with celestial signs on it. Before that I game him Fromm dry kitten food. I give him half a can in the morning and half a can at night of...Friskies wet food....is that a problem? Is there a high quality, but budget effective wet food that would be better for him? I'm even open to the idea of making their food (he has a big brother by two months)