According to the SPCA he was a Pit Bull Mix.
He seems to be much more lean than what I've seen most Staffies to be, and a bit bigger. He doesn't seem to have any dog agression issues, but to get an idea of proportion, this is him playing with our 100lbs+ Rhodesian Ridgeback/Black Mouth Cur mix. Bishop's 9 months old now, so I think he's got a bit more filling out to do.

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