It didn't fit my dog, so I only tried it on and it's unused. It's still stiff leather, so I think it will soften and become a collar customized for your dog as you use it. Length: Approximately 41cm Diameter at the last hole: Approximately 11cm Please note that there may be some errors due to amateur measurements. Purchase date: November 2024 #dog #dog #mediumsizedog #largedog #smalldog #collar