So sorry for your loss. You have me crying with you. I lost a few old friends to age too. I’ve only had to make that decision twice for my beautiful pets and I’ve had many over the year. It was the last two a cat and dog both 8 years old, and within one month of the other. I miss them so much. I hold a lot of guilt even though I know it was the right thing to do. My condolences and sympathy. God Bless.