Not bursting my bubble, i'm from Cape Cod so i know how popular "dawg" is (heh). That's in the real world though. It doesn't translate that well to internet usage.
For example, i know somebody who created the brand "iowadawg" and with little effort, claimed the top search spot on google, twitter, basically everywhere - BECAUSE the word "dawg" is so infrequently used in domain branding.
I suspect i could do the same thing with the word "caht".
Don't be mislead by the 75k price tag on prdog.com, it's worth nothing also.