My Shorkie is 8.5 lbs and his chest and length are both 14 inches.
Ordered a medium fits perfectly.
Very happy with the quality. Would buy again.

So this jacket is super cute but it's also very easy to put on and take off especially when you're dealing with a squirmy little puppy.
We took a short walk in light rain after receiving it and I wouldn't call it water resistant but the rain didn't soak all the way through either. By the time we came back inside the white fleece inside was still dry but the pink nylon fabric on the outside was completely wet. I gave it 5 stars because I bought it thinking it wasn't going to be water resistant so it wasn't a surprise but I still feel it's important to mention so people know what to expect. I think if it was heavier rain or we were outside longer it would eventually soak through but it's good for light rain or just cold weather which is what I bought it for. It's also good for just a quick potty trip since it's so easy and fast to put on. I love that there is an hole for the leash and a snap for the hood. It's just all the small details that makes me love it. Also did I mention it's adorable, so adorable! I won't be able to say much about the durability though because my puppy is only 5 months and I am positive she will grow out of it before it has a chance to fall apart, she is growing so fast!

This is the cutest lightweight jacket! (I have the "hoodie" snapped to the back and his collar will be easily attached to his leash. There is an opening for leash if hoodie is over the head.) It has a fleece lining that will keep him warm on our cold nights while he's outside taking care of business. I measured as chart indicates and ordered size medium. Perfect, not tight and not loose! He's a 4 year-old Miniature Schnauzer and weighs 13 lbs. Hope this helps.

Ollie is 9,5 years old and weighs 22 pounds. Everything article of clothing we have ever bought was correct in one area or incorrect in another. The chest, the body circumference, and the body length are on point! Most importantly, the collar is where it should be on her chest and head. Most clothes we've purchased had too large of an opening which had us constantly adjusting the fit. It's perfect!!

It fit! William is a Mexican Hairless and very difficult to fit with his cold weather outerwear. He's 15lbs,16 inches from neck to tail, and 22 inches around his chest. I ordered an XL just to be safe since the jacket has snaps instead of Velcro. I could have probably gone with a L but the XL covers his back down to his tail and isn't restrictive around his neck or chest. It's a really nicely made jacket and the inside is very soft and warm. I also love that the jacket has snaps instead of Velcro because Velcro just doesn't hold up after a few walks in the rain or snow. I'm very happy with this jacket and will be ordering a 2nd one in a different color so he has "options" - lol! He likes to look his best when we run into his girlfriend (a blue healer), named Mona :)