Sam and Abby, There are a couple of things that could cause these symptoms. She could have some type of congenital leg or spinal cord problem. Some of these are very treatable; for example, patella luxation ( knee caps popping out of their sockets). Some of these problems require an orthopedic specialist to diagnose. Dark red stools could indicate a bacterial infection, parasites, or stomach ulcers. Abby is very young to have stomach ulcers. A good physical exam and a fecal analysis would be a good place to start. Good luck, Dr. Weiss (301) 299-4142 [Posted in FML issue 1287]