She's a fox terrier mix, less than 20 pounds and loves to be taken to dog parks so she can run. I would rather bike but the two parks near me are about 3 or 4 miles away. I don't want to make her walk all that way with me on the bike, especially in the kind of traffic that we could encounter.
So I was looking at maybe putting her in some sort of trailer, but with animals it's a hit or miss what works. I realize that what works for someone else might not work for me or my dog's feisty-ness but anyone with experience and suggestions would help.

I'm currently considering a Schwinn Kid Trailer like Tom Stormcrowe has.
http://www.amazon.com/Schwinn-Bicycl.../dp/B003EESOFW

I'm riding a Jamis Coda and will be on paved roads.

Thanks