I have felt the same way as you do now twice, and twice I was wrong. I had a female Dachshund that I loved and lost, and then a male Standard Poodle that I adored and lost suddenly one day and very unexpectedly. I have now had a second male Dachshund for 15 years, and I’m every bit as attached to him.
My point is that no dog is ever a replacement for a dog that you have loved and lost, but as long as you live, there is another dog out there somewhere that needs your love as much as you need theirs. Take the plunge when you feel up to it. You won’t regret it.
Apologies to the OP for hijacking the thread.