There are no guarantees in life. However, every Cogins Maltese Puppy comes with a full two year health guarantee for hereditary or congenital life threatening illnesses. My experience is that very small Maltese can be just as healthy as 4+ pound Maltese. With that being said, the smaller pups do require much more care due to their fragile size. Please note: I do not breed for the smaller ones, my goal is to stay within the AKC weight standard of 4-7 lbs.