On a average how long does a catch dog last?

In the 14 yrs I have been hunting almost all my catchdogs have died of old age, or retired. I have only lost a couple to MIA/reasons unknown as they never came back. So I figgure a hog got them. My old male dogo was around 15 yrs old or so when I lost him this past winter and he was still hunting up till then. I go through more cur dogs then catch, but I am rougher and harder on my curs I guess as I expect them to catch anything 200 or less. Unless it is a sure nuff bad ass and then I send in the calvery. Even then I am not sending less then 2 sure nuff catchdogs in. Most times it is 3 or 4, but then we are out to kill hogs and none are leaving alive 98% of the time. I do not believe in giving a hog a chance, or "fair fight". I want the hog caught, killed, and dogs out hunting for the next one.

IMHO a catchdog will live longer if it is paired with another dog of the same hight, weight, speed, body type, and disipline as itself. I have tried to always match my catchdogs this way and so far it has worked for me. The only times I have lost a catchdog and knew why and which hog did it was when I ran a sure nuff catchdog with somebody elses "catchdogs" and he was the only one there besides a 13 mth old bulldog pup, and he was killed due to no help. Just my 2 cents LOL.