I don't use dowels but do use biscuits, most times I search for and use the narrower ones, eventually the thick ones are all that's left and I do put them in the oven or toaster oven to dry and shrink them up. I add glue to the biscuit holes, so if they're too tight before gluing they're impossible without hammering after. Quite a few times I've used biscuits along with Gorilla glue, between the water in the hole and glue on the biscuit they need to be baked.
Never bite the hand that looks dirty!
The more you know the more you're worth