They gave us a choice of "accessories" at the shelter to take home with her. Given the thickness of her neck, I decided the harness would be better than the collar, but they still gave us a collar to put the tags on.

She's had a very good second day, the kids have been working with her on sit, stay, come, and lay down, and we haven't had any accidents in the house because the kids have been taking her out every time she starts sniffing like she needs to go.