Issues that involve dog bowel movement problems range from symptoms such as diarrhea and blood, to constipation and everything else in between.
Dog bowel movement problems can be caused by the following diseases and conditions:
Dog Colitis and Irritable Bowel Syndrome
Inflammatory bowel disease
Acute Infection Canine Enteritis
Canine Malabsorption Syndrome
Read more at Dog Health Handbook: Dog Bowel Movement Diseases and Conditions