I have 3 dogs. A 9 year old Daschund, a 3 year old Rat/Jack Russel terrier, and a puppy who is a mix of many small dogs. ****zu, daschund, cocker spaniel, Jack Russel, rat terrier she's just a mix. I work and am away from home for about 9-10 hours at a time. I have kennels for them all but would feel bad leaving them for so long. So I'm getting their dog house set back up. I have a dog house with a door flap sitting on wood with blankets, that the puppy drags out and the 9 year old shreads daily, so I need ideas on how to have some heat in there that they wont hurt their self chewing. Any ideas?