Great for post op covering. My sweet Rott is over 50lbs and based on measurements, we got the 2XL.
There's a little room to spare but I feel like it fits her odd, like the neck should be further up. The snaps also are pulled in close in order to meet but there's still slack under the belly portion. I was worried the hole in the back to relieve herself would get dirty but it's been 4 days and there's nothing, so the measurements are truly the key here.
Despite me being a critic, this has stayed on even when she rolls on her back or attempts to play. The leg holes are well fitting without being too tight. Highly recommend if you don't want to do a traditional cone or fret nonstop over a possible ruptured suture or infection.

This is sized very big. My dog is an 80lb American Bully. I bought a 3X and that was practically falling off her. So I ordered a 2x, that one for better, but was still big. So I ordered an XL and that pit perfectly

This is amazing!! My dog got spayed and we knew she wouldn't wear a cone so we bought this instead. This is perfect. Very stretchy and breathable. Not too difficult to put on or take her potty. Recommend 100%, I just wish the sizing was better

I have bought and returned probably 10 of these, searching for just the right product to keep diaper wraps on for my 8.5 lb. chubby male Chihuahua, Yoda, 9 years old. I already have a brand I am able to use on both my 19 lb. male Shih Tzu, Charlie, just turning 12, and my 38 lb. female Black Lab mix, Dani, just turning 10 "” the SurgiSnuggly. The Medium (Charlie) and the Large (Dani) fit them both perfectly. But when I tried getting a SurgiSnuggly for Yoda, I hit a snag "” the SurgiSnuggly is just not stretchy enough for my chubby little boy. Following the measurements, the XS was right measurement-wise, but he like a sausage about to explode, and getting it off was traumatic. So I tried the small, which was a little too long, but here again, it was a little better but still small around. I ordered different brands and I simply don't know who writes these up, but UPS now knows me as I'm coming through the door with onesies. When I received the large in this (measurements for a Chihuahua?) I had to laugh "” poor Yoda was in a sack with his head sticking out. I put in for a return, but liked the fabric so much, I decided to take a chance with the small "” it was definitely stretchy enough. I decided to order the medium for Charlie to have a spare and waited to return the large until I knew if I was going to have to return one or both of the other two. Well, HOORAY! Perfect fit for both Yoda and Charlie!! They have snaps, but truly, you just have to slide the back legs out and roll it up and remove the diaper for them to do their business! I can't use a wrap diaper for a female, but Dani was found housebroken, so not an issue. She does have some anxiety issues "” I adopted her from Hurricane Harvey in Texas and she was an emotional wreck. But that has gotten much much better. I'm sure if the time comes I'll figure it out. But I decided to try the large on Dani and, believe it or not, perfect fit! And they look very classy in the gray!

SO I wrote all this to give an indication of which size actually fits what size dog for this product. Ignore the chart and use my review!! Aside from Yoda, both Dani and Charlie are average build. I've attached pictures. I hope this helps someone after I was tortured in this process! You're welcome!

Be prepared for the buttons there's a lot but other than that's this this is awesome my pup had surgery and hated the cone but this worked better for her

It's a bit big but I had to get the 3xl because she is so long.