dehydration definitely causes a change in stool consistency but not usually color. water is actually stored in the colon (not the bladder) and can be used by the body when needed. during times of dehydration water is pulled from the colon and will result in dry hard stools (constipation). stool color changes can be due to many things. for instance if you took pepto bismol your stool would turn black from the bismuth. the types of foods that you may eat may also change stool color. knowing the color of the stool can give a clinician a clue as to the reason.
does dehydration change color of poop?