The bottom line part 3 - signs to watch for

Characteristics of Diarrhea

Color	Likely Cause	Likely Location
Yellowish or greenish	Rapid transit	Small bowel
Black, tarry	Upper GI bleeding	Stomach or small bowel
Red blood or clots	Lower GI bleeding	Colon clots
Pasty, light	Lack of bile	Liver
Large, gray, rancid	Inadequate digestion	Small bowel or absorption

Consistency	Likely Cause	Likely Location
Watery	Rapid transit	Small bowel
Foamy	Bacterial infection	Small bowel
Greasy, often with oily hair around the anus	Malabsorption	Small bowel, pancreas
Glistening or jellylike	Constains mucus	Colon

Odor	Likely Cause	Likely Location
Foodlike, or smelling like sour milk	Rapid transit and inadequate digestion or absorption (suggests overfeeding, especially in puppies)	Small bowel
Rancid or foul	Inadequate digestion with fermentation	Small bowel, pancreas

Frequency	Likely Cause	Likely Location
Several small stools in an hour, with straining	Colitis	Colon
Three or four large stools in a day	Inadequate digestion or absorption	Small bowel, pancreas

Condition of the Dog	Likely Cause	Likely Location
Weight loss	Inadequate digestion or absorption	Small bowel, pancreas
No weight loss, normal appetite	Large bowel disorder	Colon
Vomiting	Enteritis	Small bowel, rarely colon