You are in NYC, these vets see all the diseases walking around on the sidewalk because they walk into his office. Until your puppy has all her shots, it's much safer to use a cart. The fold up ones you see people toting groceries around in, like this:
Venus of Crooked Creek 1/26/13
Otto von Hena-C 05/23/08
Morgan Donnermond 08/04/01 to 9/28/12 Long Live the Queen!
I have duct tape and I am not afraid to use it.