Why Boxer dog's die young

Not having read the whole thread yet, but I have a 7 year old male Boxer named Curly, the coolest dog I have ever had. The things we have to watch for is strictly no table scraps, they have a problem with their intestions, they can knot up. Every time he gets scraps or even into the cat food he gets the squirts and is miserable for a day or so. we have to keep a very close watch on his diet. Also worth mentioning, watch for the toys they play with, we had a mixed puppy before the Boxer and he had a knot toy thr kind that was made ot braided string made for dogs and a ball with 3 spikes sticking out from it, he got really sick and had to have part of his intestines removed because of the string he pulled off the knot toy and a piece of rubber ball toy stuck in the intestines and the string wraped around them, long story short both toys were sold as play toys by the Hartz corp. my wife sent them a letter asking for a warning label to be put on it to say always supervise, they refused to do that but took care of the vet bills with out being asked to. The point is to keep a close eye on the diet and the things they play with. Ed