This is from 2011, but I hadn't seen it before.
Text from Youtube: Canyon Crest K9 Training Center owner, Ron Pace, saves the life of a boxer with CPR during a regular training session. During the session, the dog went into a seizure. As he stopped breathing and laid down Ron handed his assistant his iPhone with the video on and said to capture this so a veterinarian can see what happened. At that point he said to the handler move your hand so I can see if he is breathing and she said he is not. Ron immediately applied CPR. Sugar had stopped breathing for 2 minutes. He finally regained consciousness. Once the dog was resuscitated, the owner took him to the vet.