+1 for walkies.
Above all, walking our furkids stimulates a BM, and is very effective. So is the little treat they get the SECOND they finish pooping.
Raw fed dogs poop a LOT less, and often go 3+ days without pooping anything. So that's normal over here, cuz raw meat is more fully digested and contains no "filler" (eg, plant matter) that just gets ejected out the other end. Less poop, less often.