Befriended: "I've decided! By a unanimous vote, we are now friends!"
Loafing: "I'm dog tired."
Freed from Crank-a-kai: "We are two for the price of one! Quite a bargain, eh?"
His two heads is similar to Orthrus of Greek mythology. While lesser known than Cerberus, he too was a guard dog, as he had helped guard Geryon's cattle. He was killed by Hercules as part of his 12 Labors.
"Kaoberos" is a combination of kao (顔, "face") and Cerberos.
"Dobbelmann" combines the words dobermann (doberman), doppel (double) and mann (man).
"Multiniche" is a combination of "Múltiple" (Multiple) and "Caniche" (poodle).