a week ago i sold my brindle dog Billy as i could no longer cope with his chewing i was forever rebuilding the pens as he would chew the doors off, chew the spa's and even his kennel, i tried him on a chain but he was even worse chewing the kennel and the fence even, i tried everthing and even raw creosote did'nt stop him, he was getting plenty of exercise and lamping regular so boredom was'nt the reason.he just did'nt like being confined, i even left his pen open allowing him freedom to go where he wanted until he nearly killed a neighbours border collie. until then he had never fought with a