Bests & Worsts Reviews from Amazon

These do run a little small. Aloy (the striped tabby) and Worf (the black shorthair) are each approximately 6-8 lbs. Gus is almost 6 months old, but is half Maine Coon and is 4lbs. They're all wearing a medium, and I wish I'd gotten a Large for Aloy. She may outgrow this in the girth area, although they're all rather slim. As other reviewers have said, if in doubt, order a size up. That said, this is fantastic. No, Worf and Aloy didn't want to get into it the first time. There was a bit of "I'm not sure how to walk and cat at the same time", but I brought them to a very interesting area in our backyard and let them get their bearings. The harness does impede jumping, but in moments they were sniffing around and after two trips outside in the same day, they feel the harness is an acceptable price of admission into the back yard. Gus was bemused by the harness, but his roly-poly self was more than game to try it. I love the design. Worf got his off the first time, but only because I didn't put it on snugly enough. He was actually more comfortable and confident once it was snug, too. Once I got that down, I saw quite clearly that they're not going to escape the harness, and don't even want to. I will almost certainly get a 2 Large ones, just to be ready when for Gus' inevitable growth and in case either Worf of Aloy grow a bit more.