A Lifespan of About Twenty Years

This is something I will probably incorporate:
Wolves usually live up to 20 years. They live longer in captivity, but rarely past the age of 25.
Wolves were the most successful mammal until humans came around and took most of their range away.

Which is smarter, a wolf or a dog? Wolves! They are at least 10 times smarter than the domestic dog!

There has never been documentation of a healthy wolf attacking a human.
I had thought to place the age of Ruddy at around 22 or 23. That's long in the tooth, and appropriate for his level of experience.