If Apple were to make a charger with steel-braided armor cable to prevent animals from chewing it, there would be a 250 reply thread on HN about how obnoxiously heavy and inflexible Apple chargers are. And some guy's cat story about how it destroyed the charger anyway.
B) I have several dell charging cables and they're just slightly more substantial and don't feel bulky at all. In fact if anything the cord from the charger to the wall is slight overkill.
C) There is a solution well inbetween that steelseries uses for their mice:
http://www.hardwareheaven.com/reviewimages/steelseries-kinzu...
I'm not sure exactly what it's made from, but cat has not even gotten close to damaging it yet. Not saying it needs to be on every cable, but for a $75 cable it would be nice.