@mark noble,
Unfortunately there is no easy way to recover from the loss of a loved one whether they be a human or a dog, and I can appreciate that the pain can be just as great in either case.
It's cliche, but it takes time.
I've experienced the loss of both and in every case with my dogs it's been extremely painful, but not so with every human I've lost. This is due in large measure to the fact that I have "known" a lot more people than dogs, and because of the special, less complicated bond that can be established between human and dog. Less complicated, of course, doesn't mean more superficial.
While "experts" write of certain stages of grief, everyone experiences it somewhat differently and finds different ways to deal with it. It doesn't ever completely go away because the loved one never comes back, but, with time, it lessens.
For me, and specifically with my dogs, I have found that thinking about them and how I loved them and how they seemed to love me was very helpful. I looked at pictures of them, and kept their belongings (bed, toys, food bowls) around the house for several weeks after they passed. I'm sure that for some people this would only intensify the grief, but for me it was helpful.
I also found it was very helpful to talk to other people who had lost a dog. Most of them "get it," and you won't hear "For Chrissake, it's only a dog!" Almost everyone who "gets it," has many happy memories of their friend which they are glad to talk about, and they'll also be glad to listen to you talk about Spot.
It's helpful too that the consequences of your dog's passing are actually very limited in scope. There is an emotional void you have to deal with, but there aren't issues with estates, caring for children left behind, lost income, and all of the everyday matters that survive a person who has passed and intrude upon your grieving. For some people, I'm sure, these matters help to distract them from their grief, but I've always resented them and found them complicating sources of additional anxiety and stress that laid on top of grief made the passing all the more difficult to come to terms with.
It's also very helpful to know that if you loved your dog, then he surely loved you with all his heart and was very happy. Dogs are so wonderful because they want and even need to love you and will, unconditionally, even if you don't treat them as well as you can. It doesn't take much to make a dog happy, and from what you've shared, I have no doubt that Spot was very happy throughout his entire life. The same can't be said for people.
He also lived a very long life for a dog of the size he appears to be in your avatar. My last dog was a Lab and he only made it to 10 and my current dog is also a Lab and she is now 10. Given her current physical condition, I can't imagine we'll have her with us another 6 years, but she's happy because we love her and give her attention.
So you can take solace in the fact that Spot led a long and happy life, with someone he loved very much.
People feel differently about replacing a lost pet. We went several years without another dog after Logan died, but it wasn't because of a sense that he could never be "replaced," and we didn't want to try. Of course he couldn't be replaced, but it was circumstances rather than emotion that accounted for the time period between him and Nala.
I realize Nala could probably go any time now, but there's no point in dwelling on it and it just means we appreciate her even more now. We don't have anything like a plan for when she passes, but I don't see us living the rest of our lives without a dog in the house, so when the time comes, we'll see how we feel.
We're both 60 now and while we have always had big dogs, if we do get another, it won't be big. I never thought I could stand a small dog, but that was silly. My daughter has a Cavalier King Charles Spaniel and he's a hoot. I could easily see one in our future.
Thinking about getting another dog may not seem right at this time, but it can also be helpful.
So, at the end of all this there still isn't an easy way to deal with the grief and like I wrote, you will never completely recover, in the sense that you will find yourself missing Spot for the rest of your life. It won't be daily, and it may not be very often, but you will miss him and it will be bitter-sweet.
But bitter-sweet isn't bad, and it's never a bad thing to remember with fondness someone (human or dog) who has passed. The alternative is that they have been completely wiped from existence and that seems horrible.
Hang in there Mark. It will get better. Treasure the time you had with Spot and keep the memories alive.