On a average how long does a catch dog last?

I don't suggest you buy a dogo. Especially a high priced one. I would not pay much, if I was just buying a Catch dog.

When you are paying thousands of dollars for a dog, no matter the breed. You are more than likely buying much more than just the dog in front of you. You are buying a piece of their parents, grandparents, etc...You are paying for the security of the time and effort put forth by the breeder to assure you are getting a dog with accurate pedigree information, solid genetics, and great temperament.

If you really just want a RCD get a pit/cur, catdo, etc. If you are looking for specific blood, temperament, conformation, health, etc....thats when you spend that kind of money.

To the specific question of how long a Catch Dog lasts, thats up to you entirely. How will you prepare your dog physically to overcome the obstacles that he/she will encounter ie conditioning, training and so on? How will you gear them up? How will you care for them when they need recovering? How hard will you be hunting them, and how solid are the dogs in the pack they will be hunting with? Too many variables to get you a real answer IMO.

I would like to agree with Gutpile, as that should be the ideal age/health time period between 1-8 years, though I just went out hunting with a female dogo who was over 10 years old and she was keeping up pretty well.