As a K9 guy I've sadly been there many times.
Here's my advice for what it is worth.
You just performed an act of kindness that only someone that truly loves you can do. Helped find peace where there was pain. Not selfish but full of compassion and love
Find a dog and go sit off to the side. Tell him or her all about your dog. How amazing..silly..brave..funny. Whatever you want. They will pass it down to the other dogs and praise his life. Have a bowl. Let the dog do it's job while you talk.
From experience I know you have a whole in your heart. Let the dog start to patch it for you.
Everytime you think about your dog. It comes back to life just a little bit.
I'm sorry for your loss.
Every one else should hug their dog.