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How old are the dogs and were they left unattended for the 12 hours in the house?
Young dogs, and puppies naturally chew and will chew and destroy things out of boredom. Even adult dogs will chew and destroy out of boredom.
We never leave our furkids for longer than 3-4 hours (at the most) and always put them in crates/dog containers for that amount of time. If we are going to be gone for a longer period of time, we arrange for a friend or someone to come in and let the kids out and spend some time with them. If we are going to be gone for 12 or longer, we take them to our vet's for kenneling. They are let out to play and time is spent with them.
Dogs are very social animals and even if you have two or more of them, they still get upset when the rest of their pack (you) are gone and that disturbance causes issues. The stress of it can cause chewing and destructive behavior.
Also, some dogs have a higher level of energy and when left alone, that higher level of energy can come out as destructive behavior. It does not mean the dog is a bad one, just that it needs to have it's energy and actions redirected.