Educated Boar hogs!!

How many times you get close enough to the bay to see a boar bayed and they break before you catch him, then when thye bay again you send the catch dogs to find you have a hog of a different color?
Hard to tell when you hunt a place that has all black hogs, but I know it happens alot (has to me).
Thats why I question, when folks say my dog will stay bayed on the same hog it started for hours and hours, I have to laugh, cause if you are free ranging hunting and you dont haver ear tags in the hog, then how do you know its the same hog? I think hogs tag-team way more frequent then people want to admit.
Like said up above, Non believers go watch dogs work in a big wooded training pen, watch, observe and see what you see.