The question is inane, anybody who doesn't earnestly value the life of a human more than the life of a dog is morally bankrupt. And frankly, I think most who claim otherwise earnestly do not feel that way when put on the spot. Given the choice of dying young or receiving a porcine heart valve transplant, I am quite sure what damn near everybody except a handful of nutjobs would chose.
Lots of reasonable points could be made to counter that opinion.