TL;DR
Healthy dog poop is chocolate brown, firm and easy to pick up. The colors that need attention are black and tarry (possible bleeding in the stomach or small intestine), red or bloody (bleeding lower down), pale grey or clay-colored (bile not reaching the gut), yellow or orange (fast transit or bile problems), and greasy grey (poor fat digestion). Green, white specks and occasional color shifts are often from food, grass or treats. Two senior-dog points matter most. First, black, tarry stool in a dog taking arthritis anti-inflammatories (NSAIDs) needs a vet the same day: in a camera-capsule study, 10 of 12 dogs (83%) on long-term NSAIDs had erosions in the gut lining, usually without any outward signs. Second, blood in diarrhea is common: in a UK study of 1,835 dogs with acute diarrhea, 29% had blood in the stool, yet over 80% recovered after a single vet visit. Color plus your dog's overall state tells you how urgent it is.
Dog poop color chart
| Color | What it can mean | How urgent |
|---|---|---|
| Chocolate brown | Normal | Fine |
| Black, tarry, sticky | Digested blood from the stomach or small intestine (melena): ulcers, NSAIDs or steroids, tumors, clotting problems | Vet the same day |
| Red streaks or fresh blood | Bleeding from the colon or rectum: colitis, straining, parasites, polyps, tumors | Vet within a day or two; same day if large amounts or the dog is unwell |
| Jam-like, bloody diarrhea | Acute hemorrhagic diarrhea syndrome, parvovirus, severe colitis | Vet the same day |
| Pale grey or clay | Bile not reaching the gut: gallbladder or bile duct blockage, liver disease | Vet soon, same day if yellow gums or vomiting |
| Yellow or orange | Food passing too fast, bile issues, food dyes | Watch; vet if it lasts or with other signs |
| Greasy, grey, bulky | Poor fat digestion: exocrine pancreatic insufficiency, malabsorption | Vet soon, especially with weight loss |
| Green | Eating grass, green treats, rarely rodent poison containing green dye | Usually harmless; vet if poison is possible |
| White chalky | Too much bone or calcium in raw diets | Review the diet |
| White specks or "rice grains" | Tapeworm segments, or undigested food | Deworm; vet check |
| Mucus coating | Large bowel irritation | See mucus in dog stool |
Iron supplements, bismuth stomach medicines and activated charcoal can also turn stool black without bleeding. Beets, carrots and colored treats can tint stool red or orange.
Black, tarry stool (melena)
Melena is shiny, sticky and black, like tar, and often has a strong smell. It means blood has been digested, so the bleeding is usually in the stomach or small intestine.
Common causes in older dogs:
- Ulcers from anti-inflammatory medicines (NSAIDs such as carprofen and meloxicam) or steroids, especially when combined.
- Stomach or intestinal tumors.
- Liver or kidney disease. See elevated liver enzymes in dogs and kidney disease in dogs.
- Clotting problems, including some rodent poisons.
- Swallowed blood from a nosebleed or mouth bleeding.
NSAIDs and the gut
NSAIDs are the most common medicines linked to stomach and duodenal ulcers in dogs. In the capsule-camera study of medium and large dogs taking an NSAID for a median of 6 months:
- 83.3% (10 of 12) had erosions in the gut lining, compared with 3 of 11 control dogs.
- Erosions were seen with all three NSAIDs studied.
- The dogs had no obvious symptoms.
The authors advise using NSAIDs with caution, especially in dogs with other conditions that raise ulcer risk. NSAIDs remain an important pain treatment, so do not stop them without your vet, but never combine an NSAID with a steroid or another NSAID, never give human painkillers, and call your vet the same day if you see black stool, vomiting or a drop in appetite. For other ways to support joints, see arthritis shots for dogs and hip dysplasia in dogs treatment.
Gut bleeding can also cause anemia, so check the gums. See pale gums in dogs.
Red or bloody stool
Fresh red blood usually comes from the colon or rectum. A streak of blood on a firm stool after straining is often minor. Larger amounts or bloody diarrhea are not.
In the UK study of 1,835 dogs with acute diarrhea:
- 29.3% had blood in the stool.
- 44% also vomited and 24% were lethargic.
- Over 80% needed only one vet visit.
Jam-like bloody diarrhea that comes on suddenly, often after vomiting, may be acute hemorrhagic diarrhea syndrome, which mostly affects small dogs and can dehydrate them fast. Unvaccinated dogs of any age should be tested for parvovirus. See bland diet for dogs and can older dogs get parvo.
Pale, grey or clay-colored stool
Bile gives stool its brown color. Pale stool can mean bile is not reaching the intestine because of a blocked bile duct, gallbladder mucocele, pancreatitis or a tumor. With yellow gums or eyes, vomiting or a painful belly, see a vet the same day. See pancreatitis in dogs.
Greasy, bulky grey stool
Large, pale, greasy, foul-smelling stool with weight loss despite a big appetite suggests exocrine pancreatic insufficiency or malabsorption. A blood test diagnoses it, and enzyme powder in food treats it. See older dog losing weight.
How to describe your dog's poop to the vet
Vets use fecal scoring charts that rate stool from hard pellets to liquid. A study comparing two such charts found that owners and vets often scored the same stool differently, more so than vets disagreed with each other, so a photo is the best record. Note:
- Color and whether it is the same throughout.
- Consistency: firm, soft, pudding-like or watery.
- Blood or mucus, and whether it is mixed in or on the surface.
- How often and whether your dog strains.
- Diet changes, new treats, medicines and anything your dog may have eaten.
FAQ
What color should dog poop be?
Chocolate brown, firm and formed. Small shade changes with diet are normal.
Why is my dog's poop black?
Black, tarry stool can mean digested blood from the stomach or small intestine, for example from ulcers caused by anti-inflammatory medicines. Iron or bismuth can also darken stool. Black, tarry stool needs a vet the same day.
Is red blood in dog poop an emergency?
A small streak on a firm stool is often minor. Large amounts, bloody diarrhea, vomiting or a weak dog need a vet the same day.
What does yellow dog poop mean?
Often food passing through quickly or a diet change. If it lasts, or comes with vomiting, yellow gums or weight loss, see a vet.
Why is my senior dog's poop grey?
Grey, pale or clay-colored stool can mean bile is not reaching the gut, and greasy grey stool can mean poor fat digestion. Both need a vet check.
References
- Mabry K, Hill T, Tolbert MK. Prevalence of gastrointestinal lesions in dogs chronically treated with nonsteroidal anti-inflammatory drugs. Journal of Veterinary Internal Medicine. 2021. PMID: 33534961
- O'Neill DG, et al. Epidemiology and clinical management of acute diarrhoea in dogs under primary veterinary care in the UK. PLOS ONE. 2025. PMID: 40498704
- Mortier F, et al. Acute haemorrhagic diarrhoea syndrome in dogs: 108 cases. Veterinary Record. 2015. PMID: 26023146
- Cavett CL, et al. Consistency of faecal scoring using two canine faecal scoring systems. Journal of Small Animal Practice. 2021. PMID: 33491796
For individual health questions, your veterinarian remains the best partner.
