My dogs are animals, and many "died of old age" WITHOUT slowly starving to death, and their teeth were fine. Where do you get your information?
Your dogs are domestic animals and being cared for by you, they have absolutely no bearing on wild animals. Wild animals are not pets, nor are they humans. Nature is cruel.
Here's an good article on deer aging from the QDMA and the following excerpt: [FONT=&]Many of the researchers we spoke with said a deer’s teeth simply wear out at some point in their late teens, leading to an inability to eat effectively and declining health[/FONT][FONT=&].
[/FONT]If you really want to educate yourself on the subject I suggest reading the works of Leonard Lee Rue III, Dr. Grant Woods, Charles Alsheimer, John J. Ozoga, Larry Weishuhn, Grant Woods and other prominent deer biologists (many of which are mentioned in this article) as I have.