I would be very worried. Dark, tarry stools can mean blood from deeper within the system - and that's a real concern. Whereas "fresh" red blood is from closer to the rectum, which is usually less of concern, if isolated.
I would get your pup in asap.
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~
°¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |