I have a 27 inch chest dalmatian. I ordered M and S to try them out. The S size fits but its a little tight on the chest and with the harness inside it’s too tight.
I don’t want to chance it shrinking after wash so I will keep the M size.
The M size is large for him, such that he will pee on it. I did some sewing so to make sure he doesn’t pee on it and i hope it lasts.
I’m sad about the sizing because I really like the vest.