The angrier the guard dog - the fatter the fatty
Angry, angry guard dog
2: Dogs, usually Rottweilers or German Shepherds, used to guard prisons and other high security buildings.
"No way JT, she's got guard dogs like hell!"
"I'm almost out of jail! OH SH*T! I forgot about the guard dogs!"
Often used in conjunction with teeth.
Assumed to have originated in the Canadian west provincial drug trade.