dog hole spacing

2 to 3 inches on center is what I have seen recommended. But I would first try to figure out who/what soiled on your door ;)

-- //FC - Round Rock, TX - "Experience is what you get just after you need it"

I made the mistake of laying out the dog holes on my workbench before I knew the distance I could cover with the vise. Make sure your dog spacing is less than the throw of your vise, or you will end up needing a spacer for part of your clamping needs. If your vise has a large opening (say 10-12”), you might want to consider about 1/2 the opening for dog locations

Hope the info helps, I know I’ll not make the same mistake on my next workbench.