I watched this last night, and honestly it was really facinating. Knowing that it's a fake video, but the experiments are real is amazing, and it's incredible to think that they could sustain the life of the head of a dog for a few minutes by just pumping blood into it. Also, if it actually responded to stimuli like the citric acid and licked it's nose, it's just amazing.
But i feel bad for the poor dogs who were put through all this. I know it helped pave the way for transplants and the like, but draining all the blood from a dog, then pumping it back in through a machine and then stitching it back together, only for it to die a few days later. Sad, but really intriguing.