Educated Boar hogs!!

I don't doubt that some dogs will stick to the exact same hog they started, and its gonna be more frequent in a less hog populated area then in an area that has alot of hogs. I hear it alot "they stayed on the same hog for miles and miles and took us "X" amount of hours to get to them". I believe some do, but I also know that in some areas they will run across or through other hogs and the dogs are going to stick with the easier hog, the dog will switch off, or jump another hog in the way.

How many think a dog can distinct the track of one hog from the other and will stay on the same track, rather than take a hotter stronger scent when the oppertunity prersents itself?