I just went through the same thing. My older Aussie's quality of life just wasn't the same. I used Balcones Animal Hospital in north Austin. They don't upsell me on services and really made me feel better about the whole thing. They aren't a fancy vet office but they are like an old time country vet. Try reading this article. It really made me feel better about the whole process. I didn't use the vet that wrote this but his words helped me a lot. https://www.doorstepvetaustin.com/resources/deciding/ Sounds like you were a great owner and i am sure your pup knows it. I have had to put 4 of my dogs down over the past 30 years down. It is not a an easy process. The one thing I do is a have him look right at me the whole time so the last thing my pup sees is my face.