That's what FiFi did too. Hiding the whole time. The trainer then divided up the room, and FiFi "the big bad Dobe" was with the little dogs, and even then she was shy. You should see the faces of the small dog owners when the trainer would put FiFi in with them - pure fear, they thought for sure their dogs would end up as a snack. Eventually the moved up to the bigger dogs, but not until the end of the sessions. However she still prefers to play with smallish dogs, but she's only 9 mos old, so I'm still hoping and working with her. Keep socializing!