We just bought the Pet Gear/Happy Trails stroller. You can find it at petsmart, Ebay & a bunch of other sites. We are planning on using it when we go to festivals, fairs, etc.. We are taking it to the YorkieFair in Michigan.
Wrigley loves to walk, but in large crowds, I think it will be great to have!
http://www.petgearinc.com/Happy%20Trails.htm
This is the one we bought. It's really easy to open & close and it glides great!