Second belly strap is super close to his *. All areas of contact are adjustable. Second strap lands geographically across my boys.

Small won't fit a jack russel. The back strap is inconvenient.

Perfect, fits nicely and looks great. It is just a tad big on my dog but that is my fault. The size medium is a good fit for my very large catahoula puppy.

Service dog* side strips are velcro'd on, so removable. I also like the extra handles and hooks; although, my dog is a doberman, so i am concerned because they are plastic.

Small won't fit a jack russel. It's bad because you shouldn't have to figure out customizing this dog service vest.