I have never used it as a muzzle guard, but I have used it as an accessory, decorating my car or attaching it to my walking bag. There are minor paint chips and scratches, so it is used, but it can still be used normally without any problems. I don't think it looks particularly worn out. I will lightly wipe it down and send it in simple packaging with only the item itself. My dog is a large breed, and the main body part was clearly too small, so it couldn't be worn. I occasionally put it on for photos. This item is labeled as size 4. For reference, my dog is a 21.5 kg Labradoodle (similar to a Flat-Coated Retriever, with a thick muzzle and a large, well-formed head). When I try to put it on his muzzle as shown in the photo, the top strap that should go behind the ears ends up in front of them. The main body also fits too tightly, digging into the area below his eyes and around his cheeks, so it's clearly not the right fit (^◇^;) The strap that goes around the neck is quite long, so perhaps it could be used by larger dogs with some adjustment of the strap position or a slight modification. I have included detailed measurements, so please consider them for reference. There may be some error between the outer and inner dimensions. I cannot answer questions about sizing, so please make your own judgment. I have attached a Swarovski crystal to one of the teeth. It was popular with people around me, who said it looked like a b-boy rapper! ^_^ I recommend using it as an accessory, carrying it around or decorating your dog's car, rather than for actual use! Muzzle guards can cause distress and be dangerous for dogs if used incorrectly. Please supervise your dog at all times when using it and ensure it is used safely. Especially in the summer, be mindful of panting (allowing them to breathe through their mouths) when using it. There is absolutely no need to purchase this if you are not comfortable. I will only sell it to those who understand and agree to the above and can complete the transaction quickly.