Hello, I am new to this so please bear with me. I have a billy I have had about 6 weeks I was told he is a little over a year old, they were all a little thin when I got them but have all fattened up now. This morning when I went out to feed/water he was just standing around acting a little lethargic when i put down food he normally runs over and gets to eating but showed no interest this morning, his saliva looked a little yellowish. I feed them a mix of Noble Goat/Purina Sweet feed and change their water several time a day does anyone have any thoughts?