Chase started obedience I tonight. There was a whole new group of dogs. Everything was fine at the beginning of class. But by the end another dog started guarding Chase. The other dog guarded him from other dogs Chase was playing with and at one point guarded him from me. While there was no actual snapping or biting, I found it kind of weird and Chase was upset. He likes to play with other dogs and he wants to be near me, so being unable to do so seemed to make him uncomfortable. The owner is kind of new to this dog (he's a rescue) and seems unsure on how to utilize the techniques the trainer gave her. The trainer interrupted when the dogs seemed stressed, but at one point it was me, Chase and a barking dog in a corner. While the trainer was dealing with some questions another person had. I ended up using treats to lure the new dog away from Chase. Does anyone have any ideas on how I can handle this if it crops up again?