I have 2 female Bichon frize crosses and when I go to work for 3 hrs in the morning I shut them in the kitchen/dinner where they have access into the garden via a dog door. The trouble is they keep chewing my faux leather tub chairs. I have try spraying the chairs with a spray brought from Pets at Home to deter chewing but it makes no difference. Apart from putting them in a crate while I am at work I just dont know what else to do. Any ideas?