Dog fence when sitting outside camper with dog

I just carry (2) 10' tie-out cables for when we are sitting under the awning. It just makes sure my two are close by (usually just laying on the mat watching the world go by) and I snap the opposite end to a carabiner snapped to something on the trailer. I think my Aussie could go over just about any kind of fence if he was properly motivated - and a bunch of giggling kids would be tops on his list!