Invisible Fence

It is trademarked, but it is also being used as a generic term, which means that they either aren't paying their lawyers enough, or they think the free promotion from other people using it is worth the violation.

Generally you'd call it a wireless pet fence, or just a wireless fence. But I've heard invisible fence in generic terms too. Like how a kleenex is actually called a facial tissue. I'd day you're in the clear to use invisible fence as a term without any trouble.

Or you could say "shock collar" and as the animal approaches the wire buried underground around the property, it'll get a jolt. Until the collar batteries wear out.

Calling it wireless is deceptive, because the buried cable is central to how it works. Electronic might be a better term.

http://www.invisiblefence.com/how-it-works

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Even if it is trademarked, couldn't you use it in the same manner you might mention somebody drinking a Coke, or driving a Chevy?

caw

I've also heard the phrase "electronic fence," which differentiates it from an electric fence.