Interpretation.

Depends on how many hogs you have in area, in my opinion. I have a lot of hogs, so why do I want to chase a dog for 4 hours and be passing hogs while I'm trying to get to the dog? Been there, done that, sold 'em all. For me, if they haven't gotten it stopped after a 2 mile race, I'll do my best to pick them up and go find another hog. And I catch more hogs now than I did running those 'bottomless' dogs.
A fella in Alabama asked me once, "Hey, if you get another dog that will run a hog for 5 hours, PLEASE call me and I'll buy it from you!" My response, "If I don't shoot the dog once I finally catch up to it, you can have him for free!!"

But where he lives, there are not many hogs, so he needs a dog that will run a race all day.