Like you say anybody with wire cutters can get in so securing them outside is not a real option for you. How about a cheap video camera linked to a vcr in the house, at least then you would know for sure what happened...
How about all three dogs in the house?? put the little guy in a crate and crate him? best thing for them really...
Did you pet your dog today?
Proud owner of Black rifles and Assault Canines !!!