Albert, thank you so much for your response. I had thought about that, but thought that since he has grown and flourished, I had nothing to worry about. I am going to take a poop sample to my vet asap. I think this just might be what is wrong. What do they do to get rid of the parasites? Also, what should I put the sample in? Should it be refrigerated? What a question, huh? But, I'm really concerned about my little guy. He is such a little character; I hope he is OK.