Unless you're 100% sure that nobody has brought a sick dog to play there, you're better off waiting. Plenty of places to see in the big world while they're little enough to pick up and put in a shopping cart.
Venus was rolling at 9 weeks, out seeing the neighborhood where she now walks, going to cubscouts, ball games, the beach. I had one of those fold up shopping carts for her, piece of foam in the bottom. Throw it in the trunk and you're good to go! (LOL until the pup gets so big the wheels fall off!)
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.