I got a collar for our german shepherd, it was useless, it vibrated or buzzed, there was no electrical shock, and his double coat made it useless anyway.It’s been my experience shock collars don’t work. Dogs hair is too thick to bother them.
Or my dogs just didn’t care.
Cyclone fencing with chicken wire perimeter on the inside of the cage to keep dog from digging out. Much like you’d do for chicken coop with wire on the outside