I am so sorry to learn of your loss. You can easily see in your words how completely devoted you were to your beloved Ollie, and visa-versa. The term "Cute as a button" comes to mind when viewing that delightful photo of him. Thank you for sharing that wonderful photo and some of Ollie and your story.
This is something written below, that has provided me with some comfort: "By agreeing to show our beloved pet mercy, and thereby bring an end to their pain & suffering, we transfer their pain & suffering onto ourselves. We absorb it. We transfer it from them, to us. And then we process that pain & suffering through our grief. That is the bargain that we made. The passage of "Time" is an important and unavoidable part of the grieving process. As our bodies and minds use time to process grief. Moment by moment, minute by minute, day by day, week by week, month by month and yes, at times every year by year.
The greater the love we had for our lost one, the greater the grief. The key is to just continue to travel through time, and allow our built-in healing factor to process our grief. It is each of our birthright. We must be gentle with ourselves. Eventually, our grief WILL pass, and then all that shall predominately remain when we reflect on our beloved pet, are our happiest and most cherished memories of them."
You made the right decision for Ollie. You showed him mercy. I am glad that your paths crossed with his when they did and that he was a true part of your family. And that he was so loved and adored. All dogs should be so blessed and fortunate.
My kindest & sincerest condolences,