Ain't worked for a vet have ya? In my college years I worked as a vet assistant (ok, mostly a pooper scooper), and I must admit, chows were the worse by far. In the south most chows were not groomed properly and suffered from awful flea and tick infestation causing tremendous constant pain (ever seen a chow crawling with fly maggots under their thick coat of hair prompting self scratching until it bleeds, attacting more flies).
Owners often had to trick the dogs into their cars (using food as bait) and shutting the car door on them once they accept the bait. Seeing an owner scared of their own dog is quite a sight (why keep a dog you can not control). Rabies poles come in quite handy for these animals (if you value your fingers). My personal favorite was having to bath these wild animals while they were trying to bite me slinging feces matter and urine at the same time.
In conclusion, chows are definately a top ten biting dog. Take my word for it.