'The Dog's Bollocks' is something to be proud of, and dogs are supposed to be very fond of them. They do lick them tenderly.

I've never heard 'chuffed' to mean anything but pleased. A chuff is slang for a ventral orifice. "Up your chuff, matey!"

There's an Irish-style pub here in Auckland called the Dog's Bollix. It hosts a lot of folk music.