When I had Honey in this week my vet was telling me that he is seeing more and more cancers, especially cacners he rarely saw when he started out 20 years ago. He said last week 3 days in a row he confirmed bladder cancer in a dog each day, something never before. He said he might see a case onece every month or so, but three in 3 straight days was unreal.
He thinks to much stuff is put into most of the food these deays and I think it is to many drugs. Fifty years ago our birddogs got rabies and distemper and that was it. Except for osing two to distemper (which my vet tells me wa not all that great back then, often causing the diseast) most of our dogs live to ripe old ages. We didn't lose (except one was poisoned) earlier than 8 or 9 years of age.
today they get so darn many vax, plus heart worm prevention (that is a must), and many get treaed monthly or even more often with flea/tick stuff. We never had a dog with allergies like we see today. Today they are pumped full of steoirds, etc to combat allergies. I also think food additives are part of it. hubby hauls chemicals and it is down right scarey knowing what some of the stuff is that is put in food, drugs, etc. One he hauls, the drivers call it "miracle growth." iIt is mixed with chicken feed and makes the chickens grew about double their normal rate. So apparently even if you cook for your dogs (I do cook part of Honey's food), they still get stuff they don't need .