We bought 2 of the metal pens, and hook them together for or 4 camping buddies (Chihuahuas) They love the pens and as stated prior to that they would get the leads tangled up on everything. A large dog would probably have to be trained to stay inside the pen. There are now above ground containment systems available which are portable and seem to work really great the dogs wears a collar, my neighbor has two Labs that stay inside his front yard with no problem. I am not sure where they are available but a little research will probably yield results here is wally world answer https://www.walmart.com/ip/iMeshbean-Wireless-1-Dog-Fence-No-Wire-Waterproof-Pet-Containment-System-Rechargeable-US/698279292
Good Luck and happy camping