Angus quickly adjusted to wearing this OptiVizor. Unfortunately, we did not use duct take on the side straps the first time he wore it for a while and he was able to push the shield up and chew through his chin strap. He did not, however, succeed in getting the visor off of his head. I would suggest showing the visors on a dog with the tape in place or making this a more prominent requirement, not a recommendation. By the way, when we contacted you for a replacement chin strap, you told us...