I purchased this on the advice of a Trainer. However, I have not used it, and I don't really intend to do so. I have an inquisitive and very active 7-month-old puppy. I found this muzzle cumbersome and uncomfortable. I realise that it is considered 'top of the range', but it is stiff and 'overwhelming'. Thankfully, there is always someone with my puppy, so he is closely supervised, and he is growing out of the stage of trying to eat everything he sees!!!