I love these harnesses. I love that they dont reach the neck so the dogs won't get choked if they pull. I love that they are leather because leather is softer and doesn't dig into the dogs. I followed the guidelines and bought the 14 inch for my 5.5 pound dog. It works great but after years of use it is pretty loose. I then bought the 13 inch (it says to add an inch on the guidelines) and it was a bit tight at first but after some use it now fits perfectly. I also have a red metallic one and I dislike that one. It is very hard compared to the others and even after use it has not softened. The dog doesnt like the hardness either. I plan to donate it. The nonmetallic are soft and perfect. These last a long time. The original one I bought is still fine (only the color is fading) and like I mentioned above its just a bit looser. I use it on our new puppy who is a bit bigger and it works perfectly. I would recommend this harness but DON'T buy the metallic colors unless you want a hard non-flexible strip.
Also I have a buddy belt and this works just as well IMO only it's cheaper.

Con: The leather on this halter is very stiff. It does not soften like the regular leather.

I have a 6lb Yorkie and the harness collars I have been using were such an unhappy experience for the dog and me, even the adjustable ones. This is a wonderful collar for me and the dog. I walk my dog twice a day on the capitol grounds, she pulls, runs, jumps and has a great time now...so do I. No choking. Love it. I am buying another one. I read the instructions from a review to measure right behind the front back legs up around chest with 2 fingers being comfortable able to go under the measuring tape.
I am measuring one inch smaller this time. The one I received works fine. But just one inch smaller will be perfect.

love these harnesses. ever since we got one for our first dog over 10 years ago, its all we use. made of soft leather, but we have hand washed them and hung them on the line then briefly tossed them in the dryer and they hold their shape. worth the price... other than for a color change... we haven't had to replace on yet and we have had 5 active dogs that swim and hike. easy to put on, just step in and Velcro over the leash hook.

This works great for my beagle. Her throat is extremely sensitive and before this harness I couldn't find anything that wouldn't make her gag. It didn't have to be tight, just touch her neck and she'd start gagging. This harness works great for her. She's not a puller so I can't really comment on that but for our regular walks it's great.
I was a little afraid it would rub her little armpits because the leg holes really aren't that roomy, but so far so good. I found it to be fairly true to size and am overall very happy with it. I managed to find one of the sizes that was on a great sale, but I don't know if I'd want to spend $40+ as some of them are listed for. I also may consider next time trying the mesh harness so there's a little more flexibility in the leg holes.