Green’s Dictionary of Slang

mutley n.

also mutt
[TV cartoon Dastardly & Muttley (1968-91); ult. mutt n. (1)]

(N.Z. prison) a drug detection dog.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 121/2: mutley n. 1 the police narcotics detection dog [...] mutt n. 1 the police narcotics detection dog.