I would be leery of using an electric fence for cats. One concern would be that they would cross the fence and then not be willing to come back. They might also figure out that they could climb a tree and jump over the current.
Also, while you can usually call a dog back inside, that's not necessarily so with a cat. Finally, it's not good to let a cat or a small dog outside alone for reasons previously mentioned, i.e., predators.
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