Our sweet little guinea pig died in surgery to remove a tumor. Actually - she went through the anesthesia swimmingly - the vet said she needed very little. Her heart stopped as he was suturing her up. Said she might have gotten too cold. The tumor was larger than he expected and said that without surgery she might have lived another week or two (painfully). So at the time I told myself she was probably weakened by it, although she didn't show any symptoms until that week. Her activity was normal, eating, behavior. Then she started sitting in the corner of the cage and we took her in that week. (and keep in mind we pay attention to our pets - they're in a part of the house where people walk by many times a day, they are interacted with and exercised every day.) But it's that comment he made - about getting too cold that bothers me. Is that a sign of negligence on their part? This clinic and vet come highly recommended, and he is an exotics vet - not a small animal vet.