he should not be pooping 4-6 times a day. If i were you i'd change his diet. Go to
www.dogfoodanalysis.com and get a food that is 5 stars. These are better quality.
poop is stuff in a dogs diet that he cannot digest and has no nutrients, so if he's pooping that often, his dog food must not be that good. If you feed him a better food, then he will absorb and use more of it and poop less.