@eeeefarm:
For what it's worth, I have never dealt with theft in any other way than immediately taking the object from the dog, and I have never been nipped under these circumstances by any of the many dogs I have owned, nor have any of them nipped or bitten any other person. Anecdotal evidence, to be sure, but most people I know (my generation, I suppose) deal with it the same way with the same results. I do think much depends on the relationship you have with the animal, and the consistency of your response. In my household there has always been a clear understanding of what belongs to the dog and what doesn't, and one rule I have is that nothing is ever "let go" because "it really doesn't matter" or "I'm too busy". I'm just throwing that out because I think some problems start very small and we don't notice them until they escalate. Dealing with horses…...who outweigh me by a factor of ten......I have learned to nip disobedience in the bud, before it becomes something I really can't handle. The result is animals I can control with the lightest of touches, that respect me and others, and that are as safe for kids to be around as is possible with a large, reactive animal.
Or, it could be that you haven't had a dog that was willing to bite over some item that they stole. Lucky you! Maybe it is how you handle your dogs as pups…or maybe you have just been lucky to not have a dog with temperament issues...or maybe dogs just like you better than they like other people....I don't know...
I do agree though, that many people don't address a guarding issue the instant they see it. If people did, that would help tremendously for a dog that has a tendancy to guard. Every one of my dogs has tried guarding an item as a pup...it hasn't worked, and they gave it up...except Ivy. I am not about to advise people to 'gain their dog's respect' by taking away an item when the dog is snarling and lunging at them. You and I might be able to tell whether or not the dog is bluffing...but do you want to put the person you are advising at risk by suggesting they try to figure it out on their own?