Regardless, even if it is technically more accurate, the term "racist" should never be applied to animals, because it denigrates the term by the implication that any treatment of animals can be equated to the mistreatment of humans through that ideology known as racism. In other words, if you lynch a black guy for being black, it's "racism", no worse than if you shot a black dog for being black. Which is ironic because the consideration of black guys as no better than dogs is a hallmark of racism. The very use of the term in this way, is, ironically, in itself racist.
But any person can be a victim of racist crimes, so really it would have to imply that all people are no better than dogs. While a disturbing implication, it is hardly a racist one.