Most characters are perfectly fine without hounds teeth for a while in the early game, and once winter comes they can quite easily hunt MacTusk a few times for enough of them.
However, for Willow, who relies on sewing kits to repair Bernie, it can be a big problem to not have sewing kits in the early game if the Willow is planning on anything particularly daring.
So a guaranteed minimum amount of hound mounds would be nice, because my most recent world only had one.