Cali has the same issue... she's wearing a small but it's quite large around the neck/chest area. I don't worry about it though because she's never tried making an escape before and I think it'd take her a bit of time and effort to wiggle out especially since the girth part fits her well. The x-small likely wouldn't have fit comfortably over her head either. Oh the difficulties of having small dogs! I think this harness will be more for going out/on walks and I'll be using her old black mesh harness (which fits a tiny bit better around the chest) for things like hikes and going to the beach.