I ordered the small first. It was too big in the neck. I then ordered the XS. It is a perfect fit. My dog hates it, but he hates all collars, harnesses, and clothing. However, he cannot escape this harness. It is great for traveling.

I love how soft this is and how it fits on my Yorkie so nicely. Very comfortable with the new car seat I bought also. Buckles may be difficult to adjust with one hand!

Diamond wears her new harness in comfort. I did realize but it also came with a matching leash. I purchased the harness to keep her safe while riding in the car since her back legs do not work well enough to walk on a leash. I donated the matching leash to a shelter.