I have a large Pet Gear booster. My pups are 7-8 pounds. They both fit in the booster together. But when I bring one of them out with me & leave the other at home, they are so much more comfortable riding solo. In fact, I actually use 2 boosters now because it's such a big difference. One pup has a good amount of room to move around & enough space to lie down. I say go for it! Zoe will love it
