The best/worst/ultimate, even better than dogs bollocksoriginates from a particularly vile porn film involving canines and women, where the woman concerned accepted penetration from the dogs knob as opposed to just licking their bollocks. Nowadays dogs knob is accepted as a compliment.
Q. "Did you have a nice day?"
A. "It was dogs knob" or "It was Dogs"
If you are a loaded reader you would say "it was the bollocks" (This just shows that you watch too many top 50 shows on channel 4 /5