I lost my first Boxer/Mix (Stewie) in an accident that was my fault! I was clinically diagnosed with PTSD. I was on drugs for years and afraid not to take them, was suicidal. That was 9/9/2001. When we moved to NV in 2003, I dug him up and he's in a box in my office! We will get him cremated this year and put him on the shelf with his buddies.
I have lost dogs since them but it's not the same, if it's your fault that can be pretty bad. All of us handle loss differently, there is no right or wrong.