I bought a couple of sets from Sylvia's Tack Shop, they come in two sizes and either size should work well for a sheltie. However, Davina who is 16+" with a very long nose found that the gloves laid to flat and struggled (wasted time) to pick them up. I wrote the Carolina Glove Company and they sent a variety of thicker styled gloves which happened to be men's work gloves. I shrunk them down and they work beautifully for her. I am currently using the smallest gloves from Sylvia's for Dalton who is 10", 10lbs and the bigger set to teach Rush who is 13", 12 pounds and 5 months old.
Dani
Armitage Dazzling Spun Gold CDX, RAE
Double Dare Derrick CD, RAE
Staymat Magnificent Journey CD
Blackmyst Poker Face (puppy)