Montana is aggressive with other dogs' possessions

My female Golden, Montana, just turned 1 last week. Montana is being spayed Sept. 2 (would have been done sooner, but breeders contract stated 10 months and she came into heat a week before scheduled spay in June). We live in my daughter's home, and they have a 1-1/2 year old neutered male Berner, Louie, who is so laid back. From the outset Louie would let Montana take a bone out of his mouth, a toy away, whatever and do nothing. Therefore, Montana has not learned that not everything is hers. She thinks nothing of taking a bone away from another dog, and then growling and even snapping if they try to take it back.

In two weeks my daughter is also getting an 8 week old female Leonberger puppy. I am afraid we are going to encounter some real problems and would appreciate any advice. Should I take her to a behaviorist?

Have you taken her to classes before. Does she let humans take objects from her or is this just with other dogs.

The dog with the toy is the alpha. This doggy just needs to learn that the alpha is not her and that you decide when and where the toys will come out.

Stacey - Yes, she has been to classes.
Prin - Humans can take objects from her. It is just other dogs. If I had my way there would be NO bones around, but my kids who I live with give Louie marrow bones all the time, and we have to go thru their kitchen to reach the backyard, and Montana is always grabbing a bone. Perhaps if Louie had made a fuss from the time she was little, she would have learned not to take his bones and toys, but he just watched her.

I feel it's different being the alpha to one dog and being the alpha over the dog's relationships with other dogs. That is why people have so much trouble at dog parks. It's a completely different game. Your doggy has to know that you not only govern her behavior toward humans, but you govern her behaviors toward other dogs, too. :)