I hate to disagree with you Sambo... but you’re comparing a sprinter to a marathon runner. There is no comparison.
To further my previous post showing how your own analogy is completely 180 degrees wrong, I'll also make this point. I believe it a safe assumption to assume that my dogs hold for many many times longer than everyone else's on a regular basis and do it as shown by themselves. Yalls dogs don't hold as long and must do it together. My dogs work in crops, woods, water and brush, year around. They will catch their own, relay to the other catch when intake possesion of the first catch then when I get to the second catch they role out and go in search for other pigs and catch and hold them. And again they do this in all environments and often times catch in one environment and role out across water, woods, hills, rocky outcropings, thick brush etc to catch again. Does this fit the profile of a sprinter or a marathon runner? I'll let the wise decide for i seriously doubt your bias will allow such acknowledgment and wisdom to infiltrate your thoughts