I've purchased this for a 9 y.o. Labrador Retriever of my father. The dog does not bite, but my retired father is walking him, that's why I've got it for a case. The parcel came on the 12th day after ordering. I've done proper measurements, but it is unusual to take a muzzle on. If I tighten the strap it comes into dog' eyes, but I will try to get used and wear it. The muzzle is very durable, I am sure in it. Recommended.