Aggressive Acting 2 year old Male Great Pyrenees

[Harper41]

We have a Great Pyrenees that has shown some aggression with bones in the past. My wife and I also have a Golden and Yellow Lab that are both 10 years old and our 2 year old Male fixed Pyrenees is the pup of the group. The bone aggression we totally understood because when he was a little guy the other dogs would take them from him and it developed into an issue. Now that he towers over them (not an issue anymore). Everyone in our household (3 children) knows not to approach him or any of the dogs when they have raw hides or bones.

That said, we are starting to see another side to him that is concerning us. He wants to be outside all of the time and for the most part that is ok. We have a good sized yard and the invisible fence has for the most part been effective. Currently we are putting in a large fence (but really not the issue). Going to work with my wife is not a problem which he does 3 days a week and just hangs out in the office being a rock star for everyone to pet. When we want him back in the house it becomes a major problem and when we need to go someplace and have to bring him in and not take him with us he will growl and occasionally show his teeth basically telling us that he isn't in the mood to go inside. He has decided that a patch of bushes in the front of our yard are his (and I mean his). That just doesn't work obviously so we push the issue and it becomes a game as he goes in and out of the bushes making it very hard to get a hold of him. We have resorted to treats and food and that worked for a while but now he is on to us and won't even go for that. It is mainly with my wife but she is the one who takes him to work with her and I take the other dogs with me. This growling and snapping is really beginning to concern us and think we are at the point that we are going to need to be in touch with a Dog Trainer/ Behavior Specialist.

Is there anything I am overlooking that might help us out before taking that next step. And no we are not giving up on him, just trying to become informed how to help him with this.

Any ideas or constructive criticism welcomed.