Diarrhea is a change in the consistency, volume or frequency of bowel movements. It may be acute, begin and end suddenly or become chronic, continue for weeks.
Constipation means difficult, infrequent or absent defecation.
Malabsorption is not a disease. It is the consequence of a small intestine or digestive enzyme (pancreas) disorder causing food either not to be digested in or not to be absorbed from the intestines.
Small Intestine Bacterial Overgrowth (SIBO)
SIBO is a specific condition particularly in dogs where, for a variety of reasons, a pure culture of bacteria increases and displaces other beneficial bacteria.
This is an inflammation of the colon, responsible for over half of all cases of chronic diarrhea. One cause of colitis is Inflammatory Bowel Disease or IBD.
Inflammatory Bowel Disease (IBD)
IBD is a group of diseases, each characterised by an increase in a specific type of inflammatory cell. IBD can only ever be accurately diagnosed by examining a biopsy specimen for these cells.