I have a buckling born late February of this year, and he's always lethargic. He doesn't run around and play with the other kids. The only times he runs are when I have the bottle bucket. He likes to stand by himself a lot. He's not wormy, and I don't see any other symptoms of what could be wrong with him except possibly some labored breathing (I'm not sure that he is laboring when he breathes, but it is louder than the other kids'). Does anybody have any idea what could be wrong with him? He's been this way for as long as I remember having him, but I don't think it's just his personality.