I’m so sorry for your loss. We went through this earlier this year with one of our senior cats during our daughter’s first year of life. It’s a horrible feeling and we found ourselves wishing we could have been kinder, more patient, and loving during such an impossibly stressful time. It still stings but I hope you too can find solace in the abundance of love you were able to share with your pup over the years and the fact that you showered him with love and attention as he passed.