Mermaid, I am so sorry for your loss. You MUST not blame yourself for this. Your vet should not have recommended any anesthesia for a senior like that. This is entirely on your vet who should have known better. 3 of my 4 are all seniors now. All millennium babes (born in 2000). One had seizure the last time we had to put him under for removal of a benign tumor 3 years ago but luckily he pulled through ok. The vet cautioned about any anesthesia from then on out. He now has another one and I am dreading that we may have to remove it surgically. At this age you often wonder which is the lesser of two evils.