Personally I have not lost a dog of my own as I tend to have "looser" baying dogs others often cull out to me.
And smarts has helped many dogs... Some bull dogs run straight to the hogs face and try to climb to the ear and that is suicide by pig. A good clean catching bulldog, given terrain allows, will get the ear and "lay to" along side and the hog doesn't get much chance to work them over. One of my bulldogs goofed up and let a front toe about get bit off and it now sticks up a little bit as she had a bottom tendon clipped.
The bay dogs can hunt until 8-10 so long as injuries never got them maimed. Had a buddy with a dog that had a cut achilles tendon and he did okay for years with just a stubbed toe now and then but got retired when he spent more and more steps with his knuckles down. But the average would be 4-6 years I am guessing and that isn't old age reflexes going away. The dogs actually get sharper minded with experience until then at least. It is too many punctured lungs, broke ribs, cut hamstrings and lost teeth that retire the best dogs.
And to answer my favorite question...
Heck Yes these dogs are freaking out when the truck rolls to the back yard to load the dog box!!! Some are leaping 3 feet off the ground while one of my dopey bulldogs stands on her back legs doin "dancey dance" while pawing the air doin' the happy howl... I get goose bumps hearing and seeing this but choked up thinkin' about it as I see their love for the hunt, catch and for Junior and I knowin' they get hammered with love love when they succeed!
Thanks for askin' guys!
Brent