What is it with cats and wires? Everyone of our computer cords has teeth marks in it and every time Ziggy jumps up on our laps, the first thing he goes for if they're laying on the table or desk is the earbuds.
They say many animals like plastic to teethe. Utilities have had problems with rodents like squirrels chewing cable above ground and rats chewing underground cables. That's why puppies especially chew anything hard including furniture legs, they're probably teething and not revolting.