I bought 3 masks for my small horses, in cob size, since they are bigger than ponies. The fit seems odd, as the projections over the eyes stick far out, and the ear covering is so long it falls over at the tips. I will be returning them and try again. A large pony size seems a good idea.

I love these fly masks. I ordered 2, one for each pony in different colors. They fit well and are so cute.

Bought a COB size for my Arabian. It was a bit large, and kept getting rubbed off. Bought a PONY size. It is a bit small, but fits better. The large Velcro closure keeps it secure. The ear covers have reduced some scratching due to gnats. A large PONY size would have been great for small headed Arabians.