Samantha Ronson's bulldog Cadillac has beat a hasty retreat from L.A. after a fatal run-in with a neighbor dog ... sources tell TMZ -- and we found out Cadillac has a biting record.
We've learned Sam sent her beloved bulldog packing for the East Coast to live with family ... after the dog killed a 3-pound Maltese that was roaming the hallway without a leash Monday in Samantha's West Hollywood apartment building.
Sam -- who had worked the night before -- was at home sleeping when the attack occurred. Some of her friends were in her unit. We've learned the friends told Animal Control they heard a human scream and then opened the door and found Cadillac in the hallway alone -- there was no blood on the floor or on the bulldog. None of Sam's friends are copping to allowing Cadillac to get out of the unit.
We've learned Cadillac previously bit another dog in the building and Sam agreed to send the pooch to a 3-week doggie boot camp for socialization. Cadillac returned home just 5 days ago.
Neighbors tell TMZ Cadillac had also bitten a person in the building but we could not confirm it.