I went to the seminar he held at the university of maryland school of medicine, its truly amazing. However, they didnt just revive the animals, they actually simulated injuries common in war (because in the end this is funded by the U.S Military, and they would like to save more soldiers) so they would create ruptured spleens and such and revive them, and fix them up and let the dogs live. They are hardly "zombie" dogs. He showed us videos of the dogs 1-2-3 days then up to 1 year post-revival and they were fine.
This is the same lab (started by Safar) who created CPR.