Green’s Dictionary of Slang

a Doberman dog.

1962		H.S. Thompson letter 20 April in Proud Highway (1997) 332: Now and then I see a Dobe on a leash.
1991		C. Hiaasen Native Tongue 135: ‘Ten bucks it’s a Dobie.’ ‘No way.’ [...] ‘I say Rottweiler, that’s the dog nowadays.’.
2009		J. Stahl Pain Killers 180: ’That’s like sewing a Doberman’s head on a goat.’ [...] ’Have you tried that? [...] The goat and Dobie?’.