I had to put my dog down today and I know there's no afterlife, but just this once I'm going to say that there is a heaven for good dogs.
I'm so very sorry. It can be such an agonizing decision if the symptoms or indicators aren't clear. I went through it last summer and still shed an occasional tear. I'm not sure that anyone or anything else in the universe loves us as much or as unconditionally as our dogs. It will get better. For now try to remember all the good things.
look to Sirius in the night sky, the brightest star
You never get over the loss of a beautiful loving dog .Their like your children
That's so sad. I still miss my cats. But it was far kinder than letting any of them suffer.
Losing a pet can be just as tough as losing a family member. My condolences, for what they're worth.