I had to take our beloved Slate, a black schnauzer, 14 years old to the vet at 2 a.m. He was really weak and struggling to breath, so we called their 24 hour e.r. and they said to bring him in right away. It turned out his lungs were filling up with fluid and he was essentially drowning or suffocating. I said we simply must put him down, and the vet said thank you for realizing that is the compassionate thing to do, he was suffering. So of course I held him as he drifted over the rainbow bridge. We lost two dogs last years and one kitty. FYI, I have been reading that tap water is the number one cause of cancer in our pets, dogs and cats. It MUST be filtered, even if it is just a Brita filter. And of course we should drink filtered water too. Slate was also filled with cancer, the vet believed based on a sore he had that would not heal. I am so sad, as is my hubby, we did give him a great life. He was always happy. ☺️ Now he is one more of our doggie angels.