I have great difficulty keeping weight on Ozzy--to the point we have considered thyroid cancer as a diagnosis. He has a super high metabolism, a nervous temperment and loves to work. All three combine to make him a hard keeper. He eats a completely different diet than all the other dogs. He gets a satin ball for breakfast most days. I can't get him to physically eat more kibble, so I found him a higher calorie one. He eats Acana Extreme. It's designed for working dog who are working under extreme conditions, such as -40 temps and long distances for days on end. Ozzy eats it even in the summer when he's doing nothing! He also eats raw meat, always has a bone to chew on and when it's cold or he's working alot, he gets small chunks of pork fat, salmon or beaver(when I can get it).


Satin Balls.
http://www.njboxers.com/satin-balls-recipe.htm
This recipe is for a huge batch, but you can adjust it for smaller amounts.