Owning a dog and looking after him/her not only means feeding and giving him love, but it also means that you have to make sure your pet is in perfect health. And one way to know if our pet dog is healthy is by checking out his poop. Your dog’s poop can provide clues on your dog’s health and changes in the poop’s color, consistency, size, shape, volume, frequency, and contents may be signal a variety of health problems:
Dog Poop: Providing clues to your pet’s health
Color and consistency
Normal dog poop is medium brown or yellowish brown in color and is compact, moist and easy to pick from the grass [2,8]. Abnormal stool color could simply be because of your dog’s diet (he ate something that affected his stool color) . Try to trace it to a difference in diet or a treat you gave him/her during the past 24 hours . The change in your dog’s stool could also indicate a more serious problem .Poop that changes color or otherwise looks odd may signal a variety of problems depending on the color and consistency: 
Black or dark brown poop
Black or dark brown poop can indicate bleeding (either swallowed blood or bleeding from the intestinal tract. Causes of this kind of bleeding include tumor, an ulcer, kidney or liver problems, or inflammatory bowel disease. Other possible causes can also include parasites, a bleeding tooth, bleeding in the mouth, dental disease, or swallowing the blood that results from an overlicked paw. 
Grayish, greasy looking poop
Exocrine pancreas insufficiency can be suspected in dogs with this kind of poop and the poop will have a consistency of cow feces . Aside from the color, the dog also has diarrhea and will defecate more than 3x per day . The condition occurs when the dog’s pancreas doesn’t produce enough enzymes to process the fats in his food. Other causes of gray poop include a tumor or inflammation of the pancreas (pancreatitis). 
Normal dog poop is shaped like logs and are well-formed [3, 12. If your dog’s poop is round shaped, then your dog may be dehydrated .Rectal or anal strictures which result from inflammatory disease (perianal fistula, anal sac disease, or anorectal trauma) can also cause a change in the shape of the feces. A dog with strictures in his rectum or anus will also have difficulty and pain when he poops and you may also see fresh blood on his poop. Dogs with prostate cancer will have altered stool shape which is flattened or ribbonlike. The owner will also observe other clinical signs such as blood in the urine, Other clinical signs will also be observed and straining when trying to defecate. 
Stool size should always be appropriate to the size of the dog. So if your big Labrador is defecating tiny bits of feces, then this is a cause for concern. 
Frequency and volume
Normally, adult dogs poop once or twice a day . If your dog is having less than 1 bowel movement in 24 hours means that he is constipated. It can be classified as mild to moderate constipation if your dog defecates only once every 2 days, especially if the stools are hard, dry and expelled as individual pellets. 
Infrequent and often difficult defecation can be caused by: 
- dietary causes (swallowed bones, hair, or foreign material
- too much fiber in the diet
- inadequate water intake
- environmental causes (lack of exercise, change in environment, inability to move freely around)
- intake of certain drugs (e.g. antihistamines, sucralfate, antacids, iron supplements, diuretics).
Diarrhea occurs when an animal has an abnormally frequent defecation and there is an increased fluid content of the stool (soft or fluid). It can either be acute (abrupt or sudden onset) or chronic (occurs for >3 weeks).Acute diarrhea can be caused by: [10, 14]
- Systemic illness
- Ingestion of garbage, non-food materials, or spoiled food
- Abrupt changes in the food
- Dietary intolerance
- Metabolic diseases (Addison’s disease, liver disease, kidney disease, and pancreatic disease)
- Obstruction or foreign bodies
- Hemorrhagic gastroenteritis
- Viral causes (Canine parvovirus, coronavirus, rotavirus, canine distemper virus)
- Bacterial causes (Salmonella, Campylobacter, Clostridium spp., Escherichia coli, etc.)
- Parasites (hookworms, ascarids, whipworms, strongyles, and flatworms)
- Protozoa (Giardia, coccidian, and Entamoeba)
- Drugs and toxins (heavy metals like lead, organophosphates, NSAIDs, steroids, antimicrobials, anthelmintics, antineoplastic agents, lawn and garden products, etc.)
Chronic diarrhea can originate from the small intestine (small bowel diarrhea) or the large intestine (large bowel diarrhea). In the case of small bowel diarrhea, the volume of feces is larger than normal, there is mild to moderate increase in frequency of pooping (2-4 times per day), weight loss, increased appetite/food intake, no fresh blood or mucus on the feces, no pain or straining when pooping, there may be gas and rumbling of the stomach, and there is vomiting in some dogs. 
For diarrhea that originates from the large intestine, there is smaller than normal volume of feces per defecation, increased frequency of defecation vs. normal (> 4 times per day), no weight loss, no dark or tarry feces seen, there is straining and urgency during pooping, and vomiting is not common. 
Causes of small intestine diarrhea include:
- inflammatory bowel diseases
- infection-(e.g. histoplasmosis, Salmonella spp., Clostridium perfringens, and pythiosis)
- parasites-small bowel diarrhea (Giardia, Toxocara spp., Ancylostoma caninum , and A. strongyloides)
- partial obstruction (e.g. foreign body, intussusceptions, and tumors)
- small intestinal bacterial overgrowth
- ulcers in the stomach and intestine
- dietary intolerance or allergy
Causes of large intestine diarrhea are:
- inflammatory bowel diseases
- infection-(e.g. histoplasmosis, Salmonella spp., Clostridium perfringens, Campylobacter jejuni, Prototheca and pythiosis)
- parasites-large bowel diarrhea (Giardia, Trichuris vulpis, Ancylostoma caninum, Entamoeba histolytica, and Balantidium coli
- Non-inflammatory causes
- Diet (dietary indiscretion, diet changes and foreign material like bones or hair)
- Irritable bowel syndrome
- Metabolic disorders (uremia, hypoadrenocorticism, toxins, drug administration)
- Contents or presence of blood, mucus or parasites
If there is mucus (looks like clear jelly) in the stool, it is probable that your dog may be affected with:
Large bowel diarrhea
Giardia is a protozoa that can infect the intestine of dogs. Pets get the parasite from contaminated water. Signs of Giardia infection include loose, mucus-coated stools; vomiting; bloating; and weight loss. Bring your pet for treatment as soon as you notice symptoms. 
Whipworm infection can produce mucus-coated or bloody stools; a dry, brittle coat; smelly diarrhea; and a major appetite. There may also be vomiting, anemia, and/or no appetite. 
Blood in the feces can be described as melena or hematochezia. Melena is when the poop is dark and tarry resulting from digested blood. This digested blood may come from the pharynx, lungs, esophagus, stomach or upper intestine. It becomes tarry because bacteria break down the haemoglobin in the blood. Hookworm infection can cause dark, tarry stools Hematochezia is when you can see bright-red blood (fresh blood) on the stool which comes from the anus, rectum or descending colon. Causes of bright-red blood on the feces include rectal polyps (stool is formed with blood on the surface), or some type of inflammatory or irritative disorder . Fresh blood on the poop can be seen in disease conditions such as IBD (Inflammatory Bowel Disease), tumors in the colon and rectum, Leptospirosis, colitis (inflammation of the colon), and irritable bowel syndrome (rare). 
- Tapeworm looks like grains of rice in your dog’s stool. You can also observe your dog scooting. Dogs get the parasite by eating fleas, which are the tapeworms’ intermediate hosts.
As a pet owner, it is always best to pay attention to your dog—and his poop. If you spot changes in your dog’s poop, it is best to inform your vet to determine if your dog has a health problem and treatment can be given.
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