A stool pouch for a dog comprises a sac, two leg holes, a tail hole, and two tying straps. The sac is configured for receiving and collecting dog stool dropped from above. The two leg holes are provided through an upper portion of the front portion of the sac and configured for receiving dog hindlegs and queuing the dog hindlegs therethrough respectively. The tail hole is provided through the rear portion of the sac. Each of the two tying straps extends from a corresponding edge portion of the opening portion of the sac, configured for tying over a rear portion of dog waist so as to fix the stool pouch in place. The two leg holes are disposed apart by an interval substantially same as a distance between two upper portions of the dog hindlegs.