Noel, like many dogs, has issues with being possessive of toys, food, and water. She doesn't like to share, and sometimes growls at other dogs if they're playing with a toy she wants. This isn't acceptable behavior, and can lead to fighting. Before it gets to that stage, Trainer Paula is nipping it in the bud.
The important rule to remember is your dog owns nothing. There's no need for dogs to fight over a toy, because it belongs to the person. If Noel growls at another dog, Paula immediately takes away the toy and it becomes hers. If Noel tries to own the water bowl, she has to go to her crate and watch while other dogs get a drink. If the behavior doesn't get Noel what she wants, she won't continue it. If Noel behaves in a positive manner and shares nicely, then she gets rewarded by getting to play with toys. Her current favorite is a green, stuffed crocodile.
Good job Noel!