Why does my dog pace all night? Asked By: Marian Miller. Date created: Sun, Apr 18, 2021 9:20 AM. Best answers. This occurs typically as a result of old-age changes to the brain and often leads to pacing behavior, particularly at night. This can happen as a result of the dementia leading to alterations in the sleep wake cycle or to the anxiety related to mental confusion. Regardless of age, some pets will pace when anxious. Answered By: Javonte Friesen. Date created: Mon, Apr 19, 2021 11:23 ...