Depends on the circumstances.
If I see a collar and the dog is just wandering, then no, I grab the dog and see who's he is, and contact them. If this happened several times, it would become a problem to be dealt with.
If I see a dog, with or without a collar, and it's obvious he's running deer, we get our hole diggin' gloves on. Same goes for any mean looking dogs, or any dogs with mean reputations.
For the guys who say yes, no exceptions, they shoot any dog they see, they probably don't have bird dogs. As good as some dogs are, they can't see property lines. If you are in the center of your 160 and a dog rambles by, that's your call. But if I am bird hunting with my dog on my or public land, along your marked or unmarked property line, and my dog walked 50 foot onto your property, while I was behind him, and it got shot, my dog might not be the one going in the hole.
I've gotten rid of plenty of dogs, and other nuisance critters, but judgement is needed.
Erik
Rusty Axe Camp