but the product already exists.

Does it work on rabbits? At my Mum's house, the phone-line quality was steadily degrading, until one day the phone stopped working entirely.

Inspection of the phone extension lead revealed what had happened: Chalky (our albino rabbit -- Mum's got great imagination when it comes to pet names) was house-trained, and while he was in the house, he used to sneak behind the sofa and chew on the phone cable. After a while, he'd chewed straight through it.

Maybe he liked the taste of the insulation, maybe rabbits have some kind of attraction to voltage, I don't know. Luckily, given that he'd chewed straight through the cable, phone wire is fairly low power.