How to solve pets jumping fences? 18-second video of the problem:
So it looks like a decent solution is something called a "coyote roller". 1:53 before-and-after video of a coyote roller installed at a fence top:
This looks pretty easy to DIY:
The solution is slightly different for cats. In part perhaps because they use a jump-grab-climb action for fence-hopping, and also maybe because their escape methods seem to be more intellectually driven. In this case, the roller includes tabs or paddles, and the main commercial supplier is an Australian company called Oscillot.
An excellent 4-second video of a cat's escape foiled by an Oscillot:
And another 22-second video:
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