I have gotten a couple of hogs with a HEAVY tick load and one that was loaded with fleas. However, as noted above, most of the hogs I shoot are pretty clean. Some have just few or no immediately visible ticks.

Really stink? That varies widely. Some have a very strong smell. If not too bloody, I like to rub my hunting coveralls on a smelly hog for cover scent. The smelly hogs are USUALLY boars. Some hogs don't have much smell at all. I have shot some little boars that smelled horrible and a couple really big ones that didn't smell much worse than an outdoor dog, but often as MudderChuck noted, the big ones are pretty horrible.