I'm getting so I don't feed anything as a treat except real people stuff out of my kitchen (and cheese, and hot dogs, and luncheon meat, and...) but you know, no cured rawhide, ears, hooves, bully sticks, antlers, etc that you get at pet supply places. So often whatever it is seems to disagree with my dogs...nothing huge, just diarrhea a time or two. Which is a bother to try to pick up when I'm out walking.
Hairy Dog isn't picky about chewing on nylabone kinds of things (the dobes would never even pick them up or try them), though he doesn't particularly like kongs or other rubber chews. I'm guessing all he had in his prior life was artificial chew toys
At least, he seems content with what I've given him.