An animal rights group is unleashing on Chris Klein over his DUI arrest this morning -- claiming nobody should ever drive around wasted ... especially when a pet is on board.
TMZ spoke with a rep for the group "In Defense of Animals" -- who tells us, "By choosing to drive under the influence with his dog in the car, Chris
not only put innocent drivers in danger, but broke a promise to be a
protector and guardian to his pet."
As we previously reported, Klein was arrested in L.A. this morning -- law enforcement sources tell us his blood alcohol level was almost three times the legal limit.