Any thing you can do to get and keep his immune system as good as you can.Cancer is an auto immune disease.Try feeding him Oxygen Extream and see how that does.It will make them feel good and put on weight and look good.Id bet on top of a good feed program it would really help.Call Sharon Roberts and see what she might have to say about it.Its a toll free number and definatly worth the time.866-699-4677