The Best Friends muzzle is the best fitting, most durable muzzle I've found. Previously, I tried a couple of other kinds and they lasted less than one season each and rubbed the top of the nose or the side of the face. Eight years ago, I bought my first Best Friends muzzle. It has lasted through two ponies, did not rub hair off and only just got a small hole in the base. I would consider the muzzle still safe to use, that's how small the hole is but the barn manager insists all muzzles be correct. No exceptions. Thus, it was time for my 2nd purchase. See you in another 8 years.I'm giving this a 4 only because my daughters mini is Houdini Jr and got assistance from the neighbors dog in removing the muzzle. The dog carried it back to my front door in less than 24 hours. It is well made and functionable but with him befriending a dog that is almost as tall as him I'm not sure how to keep this thing on. Oh well back to the drawing board.Doesn't stay in my standard donkey. He seems to find a way to get it off and I've cinched it on to his muzzle and he still pulled it off :(This fits my mini donkey well, I just had to double up the chin strap, which was very easy to do. It was easy to get her used to wearing it by putting tiny pieces of animal crackers in it and having her eat out of it for a bit. Gradually I could buckle it on her and feed her the cookies from the outside. Works great.Very happy with this muzzle. This is the second one I have bought and they have held up great for a fat-food-aggressive pony that does everything to get it off.too expensive for productI have a pony who is a genius when it comes to taking off a muzzle. This is one she can't remove. It is sturdy as well as easy to put on and remove (for me, not the pony!)Our pony is much happier with the muzzle on than locked away from his friends. It fits well and done not seem to bother him. Works great!