These pet barriers are much stronger than the wire garden border I was using as a guard to keep our mini dachshund from wriggling under the fence.  The  downside is the expense, but they are solid and look like they will last a long time.  They are bare metal and I would have preferred them to come with a primer coat on them because I spray painted them to match the fence and the paint is not adhering that will.  I pounded them into the ground with a hammer, which was no problem.  Much easier than digging a trench and inserting chicken wire to staple to the fence at the top (which would be an alternative low budget solution.)