Agree with Robke, never too late , my girl went through a chewing destructive phase at around the same age and we crate trained her , like urs she had other dogs to play with and plenty of exercise and things to keep her busy , she took to it pretty quickly and it soon became her safe space and part of her routine , just remember to take off his collar when he's in there , once my girl got passed her teenage stage she stopped the chewing too and we no longer had to crate her but she still used it as her den/bed