I bought the muzzle for my father's Labrador Retriever, it is 9 years old. The dog doesn't bite, but my elderly father walks with it that is why I got this muzzle just in case. The parcel arrived on the 12th day after ordering. I measured the dog accurately, but it is unusually to put on the muzzle. It comes upon eyes if to tighten the strap, but I will try to get the hang of the muzzle and use it. The muzzle is very durable, I feel certain of it. Recommend.