if you got the time... (2" in diameter) 2 Satin Balls with his feed for 7-10 days. it won't interfere with the diet you on now because ingredients (exclude salt if recipe calls for it) are all natural too and it will give you the boost in weight and your work will control it. only if you got time, an if he's a active dog crate him sooner...don't leave it on the "Jenny Track", i would not think he's cold with overnite temps in the 70's in a good solid dog house away from stimulation. good luck