Almost 2 weeks ago, my lab was asking to go for a walk, so I took him on a short relaxed walk. When we got home, an hr later, he was panting hard, laying down, than within min. looked like he passed out, tongue hanging to floor, eyes open with fixed stare, shallow breathing. Than he would all of a sudden come to, put head up panting hard. I knew he was dying, he passed out to putting head up for the next hr. His tongue was white and gums. WE loaded him in van, he didn't seem aware and took him to vet, I was surprised he made the trip and was put down. The whole time he had that fixed stare. Could not respond in the end. Since his kidneys had been slowly shutting down this past few months, the vet feels his organs just shut down suddenly,.