I've had dogs that where fed only kibble and thay lived up to 12-13 years. I've had dogs fed only on scraps and they lived up to 12-13 years. I've had dogs fed on both kibble and table scraps who also lived up to 12-13 years. As a matter of fact my dad has a Pit I left with him when I moved to the states that is going to be 12 years old and she has been fed kibble and table scraps all her life. So from my experience I can say that a dog can live to an old age on kibble or table scraps.
Right now I am feeding my dog raw, this is the first time I have ever fed a dog only raw, he is 10 months ,so I can't say anything about the benefits about feeding raw in the long run. What I can say is that I have never had a dog with such a healthy, shiny and smooth coat I mean ever. Every other dog I have owned has had a good looking coat but not as smooth or shiny and if I'm not mistaken a dogs coat has to do a lot with it's health. All the other dogs that I have owned, their coats where harsh and dry, some will say your dog is still young but thats the thing I have been feeding him raw only for a few weeks and before that it was only kibble and now his coat is way better than a few weeks ago and none of the other dogs I have owned have had a coat so healthy at this same age.
Another thing is the dogs that where fed only kibble and scraps had bad farting issues and their stool stank and they where big pasty stools, even my current dog had this issues yet in this few weeks of feeding only raw, this issues have gone completely, I mean he does not fart at all and his stool is small and hard, also his water consumption is way less.
This to me is an indication of better nutrition, you see when I moved to the states I was 220 pounds and I am only 5'6", the reason for this bad nutrition fast food and junk food. I started to loose weight and got involved in MMA, I started to eat right lots of veggies, fruits and lean meats, I ate my veggies raw not even steamed, the first thing I noticed, I went to the restroom way less and my stool was firm and smaller, compared to when I was eating all that junk food my stool was the same as a dogs when fed only kibble, also I hardly farted when I was eating correct, this might be grouse but from a personal experience I can say that raw seems to be way better than kibble, but as I said before I have had dogs live to an old age fed only on kibble, so if a dog dies at 8 or 9 years of age be it that it was fed only raw or only kibble it doesn't mean that, that was the reason it died so young.
So if my stool was pasty and stank when I was eating junk food and it didn't when I was eating correct and a dogs stool is pasty and stinks when fed only kibble but it doesn't when fed only raw, I have to say that feeding kibble is the equivalent of a human eating junk food, while feeding raw is the equivalent of a human eating correctly.
Also it is possible to get meats from animals that have no hormones, preservatives or antibiotics in them (this where the type of meats I use to eat) just go to a Health Food Store, yes they cost a lot and it would be to much for a person who has 10-20 dogs, fuck it even cost a lot for people who only have one or two dogs. Yes the meats at a,regular supermarket have many thing in them, but I ask don't we eat this meats so whats the big problem with feeding your dog this meats, if we eat them, heck even cooking this meats doesn't take away all of the stuff thats in them. So I don't see any problem with feeding dogs this meats.
R2L why don't you feed that dog only kibble for a month and work him out to see if he doesn't get hot as quickly.
Jon