We bought this backpack for adventuring with our lil chihuahua, just incase he needed to be kept close to us (like when we're camping or in a busy place) or if he gets tired on a walk, etc, and it has been PERFECT. We have used it on a busy ferry (so we didn't have to leave him in the car, but also so we didn't have to hold him in our arms), and then also when we were on a hike and wanted to cross from one beach to another at mid tide. At first he wasn't the biggest fan, but then when he realized it means he doesn't have to get wet, he happily went into it. I especially like the harness that goes around his neck -- it gives us a sense of security when he's in the pack, just knowing that he can't jump or wiggle out. We've had a few other doggy backpacks but this one, like all Ruffwear gear, is by far the best and worth every dollar!