Simone Biles' dog breeder is receiving a ton of backlash for cropping her new Doberman Pinscher's ears and docking its tail ... telling TMZ Sports he's gotten death threats over something he says is "common practice."
We spoke with the owner of Regal Empire Dobermans after fans and PETA slammed Biles and her husband, Jonathan Owens, for buying a puppy that underwent the procedures.
William Regal is also dealing with the blowback .