I hope it works out for you! I have a chow chow and feel your pain. Luckily the UK doesn't have a chow chow problem, but Allstate won't insure my house if I have a chow chow because of their "vicious" reputation. It's definitely frustrating when you know your pet is a sweetheart!
If that's your furball in the icon, pretty! We have a bunch of places like that here, but a few of them will accept a high ATT rating or equivalent for an individual dog.
I classify canine temperament by average response to "cues". Chows, like most working breeds, have some protective and defensive cues that are part of their working heritage. All that means is I might not put some individuals in the same situation I might put a lab or a classic bull terrier. However, I'd rather work with a chow with defensive cues over quite a few other breeds because I've found their responses to be fairly uniform and predictable. You can anticipate them, and control the dog's environment to keep him from having to engage those cues, like not taking your setter to your friend's house if they have a pet rabbit that runs loose.
If you've never seen any ATT data, you might get a kick out of this site. Bear in mind; percentages are calculated based on a varied amount of test subjects, so look at the number tested as well as the overall scores.
http://www.atts.org/statistics.html