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What are Passing Black Stools?

It is vital to be aware of the consistency and color of your pet’s feces for the sake of his health. While your dog cannot tell us verbally what is wrong with him, by being observant, you can read the tell-tale signs if a health issue arises. If your dog has started passing black tarry stools, then it indicates the presence of digested blood in the feces, known as melena. For the stool to appear black, there must be a significant amount of bleeding into the stomach or small intestines. Note that bleeding into the colon or rectum (hematochezia) appears as fresh blood in the stool. Any amount of internal bleeding is a serious concern. The passing of black stools could occur due to any of the following conditions: 

  • Injury to your dog’s digestive system
  • Infectious agents 
  • Hemorrhagic gastroenteritis 
  • Gastrointestinal ulceration 
  • Cancer

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Why Passing Black Stools Occurs in Dogs

Injury to your Dog’s Digestive System 

A black, tarry stool (often very smelly) indicates that there is old blood somewhere in your dog’s digestive system, and internal bleeding is a concern. It may stem from an injury to the GI tract from the indiscriminate eating that some dogs are famous for, such as the ingestion of sharp twigs, parts of toys, and other random items.

Infectious Agents 

Intestinal disorders such as intestinal parasites, bacterial, viral, or fungal infections need to be ruled out as the cause. Any of these agents can cause internal bleeding within the stomach or small intestine as the parasite burrows into the lining of the organs. If they are the cause of the black stools due to internal bleeding, then treatment will be initiated to correct this condition. Needless to say, it needs a specialist’s intervention and care. 

Hemorrhagic Gastroenteritis

While the cause of hemorrhagic gastroenteritis is unknown, it needs immediate treatment to prevent your dog from dehydration and to prevent death; it is a very serious condition. The diagnosis is likely to be confirmed with a blood test. If your dog has this condition, the tests will reveal elevated packed cell volume levels (PCV). 

Gastrointestinal Ulceration 

If your dog is experiencing this condition, it can be caused by one of the three most common causes: hepatic (liver) disease, the use of non-steroidal anti-inflammatory drugs and neoplasia, which is the abnormal growth of cells. Your dog may show no other signs of discomfort, or they may experience a lack of appetite, weakness and pain in their abdomen. There are many causes for this condition, and it needs instant attention from a veterinarian.

Cancer 

No one wants their beloved dog to be diagnosed with cancer, but unfortunately, it can happen. It is common knowledge that the sooner cancer is found, the better chances of treatment and extending your dog’s life. While the passing of black stools does not necessarily indicate cancer, the quicker you can have it checked by a veterinarian the better for your dog. Observing your dog and noticing any symptoms is important, so if your dog has behavioral changes, lethargy, loss of appetite, unusual weight loss, and unusual odors, then it is advisable to get them to the clinic for a few diagnostic tests.

What to do if your Dog is Passing Black Stools

The first thing to do is to take your dog for an immediate physical examination with your veterinarian as black stools are an indication that all is not right. If you can take a sample of the stool to show the specialist, it may help in the diagnosis. Treatment and cost are determined as to the illness that your dog may be experiencing. 

If your dog has eaten something that is causing the internal bleeding (due to a sharp or pointed object), it may be that your dog needs surgery to remove the offending object. Your pet may need a few days in the hospital after the operation but should recover quickly and just require a course of antibiotics, rest and care once home. 

In the case that your dog is suffering an infectious condition or is battling with parasites and bacteria, a course of the appropriate medication will help overcome it. Often, your dog will have a follow up examination and tests to determine if the medications have been effective. 

For hemorrhagic gastroenteritis, it can be a problem to find the exact cause of the problem. To diagnose the ailment, your dog will require x-rays and blood tests. But if these tests do not help confirm what the problem is, then a biopsy may need to be done. The biopsy can be done via an endoscopy, or a biopsy can be surgical. These samples can help determine the treatment. 

As dogs mature they can be prone to some form of cancer, and it depends on the type of cancer as to how much your dog will be affected health wise. Your veterinarian will do blood tests, x-rays, and a complete physical examination of your dog to determine the extent of the damage.

If your dog is suffering from gastric ulcers, you veterinarian will look at rehydration and fluids depending on the severity of the condition. Dietary changes require a soft, bland diet that is easy to digest, allowing healing to occur. A urinalysis can help detect the virus, and blood work will be done to allow an accurate diagnosis.

Prevention of Passing Black Stools

While it is hard to prevent every disease or condition that your dog may get,  a good management program covering their health will help. Removing sticks and hard toys that they chew on can prevent any accidents with swallowing sharp pieces. A healthy diet is still the best prevention measure to practice. Speak with your veterinarian to see what is best for your dog. Usually, a wide variety of food that is close as possible to its natural state is best. Keeping your dog fit and just below the average weight is better for their health. Some dogs are better with three small meals rather than one large one, as it minimises the risk of bloating, which can be a dangerous condition.

Cost of Passing Black Stools

Treatment costs can vary considerably depending on the nature of the illness and what needs to be done to help correct it. Dogs are natural born scavengers and can cause internal injury by eating something that is either sharp or indigestible. The expense for removal of a foreign body and follow-up treatment can average $2500. Bacterial infections can cost on average $1,600. Hemorrhagic gastroenteritis costs from $2000 upwards depending on the severity. Gastrointestinal ulceration can cost up to $2200 for treatment. Cancers can cost $2000 and more. The cost is always related to the degree of the treatment required.

Passing Black Stools Questions and Advice from Veterinary Professionals

Paru
Labrador Retriever
1 Year
Mild condition
0 found helpful
Mild condition

Has Symptoms

Tarry Stool

She didn't eat anything for two days and yesterday she had black tarry stools. She is very active and is acting normal. She didn't swallow any external objects or the kind. Today she ate breakfast. Is there something to be worried about??

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Mister Midnight
Pit bull
7 Weeks
Serious condition
2 found helpful
Serious condition

Has Symptoms

Black Stool
Tarry Stool
Shallow Breathing

My 7 week old puppy is breathing shallow and passing tar like stools. He slept most of the day yesterday after I got off work. This morning he was not eating and for the past couple of days he was not drinking water. I am at work and extremely worried about his condition. I'm trying to find a reasonably priced vet to take him to and praying that he is OK while my husband and I are at work.

Its's probably something you fed. I once gave chicken hearts and the poop was very black for the next two days.

My dogs poop is really dark he has been eating normally and acting normal what can be the problem

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Margo
Beagle
2 Years
Fair condition
0 found helpful
Fair condition

Has Symptoms

Black Stool

Medication Used

Cefpodoxime
Carprofen

She recently finished a course of antibiotics for a skin condition and anti inflammatory medicine for a fever and shakes she’s had. The vet did a blood test and her sugar was low. Since then, she’s been doing a lot better. The shaking stopped, her fever broke, and her rash is gone. She’s eating again, however, she won’t touch her kibble anymore but she’s been eating wet food. Earlier today she started passing black stool. Is it related to her to low blood sugar or is this something new? Other than that, she’s her same old self again.

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Pop
Dachshund
2 Years
Fair condition
0 found helpful
Fair condition

Has Symptoms

Poo
Stool

My dog has been fine and has been playing, drinking and eating as normal but today has passed two big stools and in one part of one of them there is a black streak running though it (rest of the stool was normal), phoned the vet who said she will be ok as the consistency is good and the black isn’t the whole way through. I’m still worried, any idea of what the black could be in such a small portion of the stool?

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Angel
Chihuahua
9 Months
Fair condition
0 found helpful
Fair condition

Has Symptoms

Dark stool

The first two days her stool was very dark and what she's passing was a lot more. Now it's a yellow looking color but her stool is coming out less. She did eat a little the second day buy now she won't eat, we do have to give her fluids by a dropper to keep her hydrated.The good thing about Angel is she still plays time to time and moves around but she lays down when she needs. Today she started throwing up this yellow stuff. She's an indoor door so she's not around other dogs but she with chew on anything that she finds in my kinds room so where always having to try to catch her on that. I'm really worried about her what could it be someone please help direct me.

My dog has black stool but she also eats different things like one day chicken on day beef . I cook home food for her. She also takes a doggie vitamin every morning. What to do or change???
Should I give her a probiotic

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Gus
Pug
11 Months
Fair condition
1 found helpful
Fair condition

Has Symptoms

Dark poop o

My dog has had poops that are black on outside but normal inside. I don’t think he has ate anything he’s not suppose to. He’s eating, drinking and playing normal, isn’t lethargic

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Sophie
Fox terrier x chihuahua
12 Years
Moderate condition
0 found helpful
Moderate condition

Has Symptoms

Black tarry stools

Sophie is 12 yrs old she was diagnosed with Cushing disease last year..she now has black tarry stools she does not appear to be in pain or discomfort and eating and drinking well but seems to be a bit solace

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Luke
Labrador Retriever
7 Months
Fair condition
0 found helpful
Fair condition

Has Symptoms

dark poop

Hi
I have a 7 months old Labrador Retriever, today he started to poop really dark (black) and kind watery. He is eating and drinking well, he’s really active. He was on a dewormer and diarrhea medication the past week. What I should do?

Did you find out anything. I'm going through the exact thing with a puppy

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Harlow
Bernese Mountain Dog
4 Months
Fair condition
0 found helpful
Fair condition

Has Symptoms

Diarrhea

4 month Bernese ate a large portion of a new, heavy chewer toy and has had very messy, watery diarrhea for 18 hours or so. She's up on shots. Last few seemed dark and possibly a bit red/purple tinged. Not sure if she ate something else. She's otherwise acting normal and she's had two meals of parboiled chicken and plain rice. We're going to call the vet when it opens, but any thoughts are appreciated!

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Scrappy
Chihuahua
3 Years
Moderate condition
0 found helpful
Moderate condition

Has Symptoms

Dark bloddy tarry stool that smell.
Dark bloddy tarry stool that smells

My 3 year old Chihuahua named Scrappy all pf a sudden today started vomitting but was acting normal. As the day has gone on he is lethargic hasnt eaten barely has drank any water. He was just vommitting almost a clear liquid but kind of foamy. Then i found a small pile of mucasy dark red to a brown color that looked like tiny kidney bean sized clots. Then i found 2 small piles of black tarry clots and it smells very bad and im able to smell that same smell on Scrappy. Im trying to hold of taking him to the vet u til the morning because the er vet is very exspensive. Please can someone help me out with this. My dog is my child and im so afraid somethi g bad is going to happen to him.

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Blue
Beagle
13 Weeks
Mild condition
0 found helpful
Mild condition

My puppy has black, tarry stool. He has no change in his attitude, appetite, or energy. He’s a very happy, active puppy, but I’m worried about his poop color. We have not changed his dog food, and he’s not lethargic at all. He has a vet appointment already scheduled for next week. Should I take him sooner?

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Bailey
Pit bull
10 Years
Moderate condition
0 found helpful
Moderate condition

Has Symptoms

Black dry stool constipation

Bailey eats ok, is constipated and has black dryish stools, had her to the vet they said pancreatitis, was treated for that, got a little better, but now back to the same, need help

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Ella
Yorkie
8 Years
Moderate condition
1 found helpful
Moderate condition

Has Symptoms

Diarrhea , gas

My 8 year old Yorkie had diarrhea for 2 days already not watery but soft, she didn’t eat anything yesterday other than chewing grass. Last night she vomit a little and it was like light brown with a piece of grass. She did it twice within minutes . The piece of grass only one. Today she woke up hungry ate chicken with rice , later on her ID digestive care kibble food and 2 milk bone soft and chewy chicken flavor . My husband took her for a walk not to long ago and she poop Black tarry poop. I call my vet but they can’t see her until 9:00am tomorrow. Should I wait or do I need to take her to urgent care. She seems ok right now . Why is this happening ? She is only 8 pounds. Also I just bought Throat Gold by Pet Wellbring to give her for her collapse trachea which I started a week and a half ago . Which by the way has help miraculously. Is it possible that this liquid which happens to be the color of tea could make her poop black or causing her this issues ?

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
3320 Recommendations
As far as I am aware Throat Gold doesn’t cause black tarry stools and I checked with Pet Wellbeing and they confirmed that it isn’t a known side effect or adverse reaction; it is possible that the product is causing a little gastric irritation which may lead to a little bleeding but I cannot be sure. You should keep an eye on the stools as there are many other possible causes for tarry stool including gastric ulcers, foreign objects, poisoning among other causes; if there is no improvement you should visit your Veterinarian to be on the safe side. Regards Dr Callum Turner DVM www.petwellbeing.com/products/dog-cough-medicine

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Ry
German Shepherd
3 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms

Black Stool

My 3 year old German shepherd had black stool today, a few formed solid poops with some smooth dark liquid, it only happened the one time sometime before 5pm and hes acting normal otherwise. the only thing he has gotten into was a bag of brunt popcorn two days ago. I have a message in for my vet but its a holiday weekend. do you think this needs a trip to the emergency vet or should i just continue to watch him to see if it happens again?

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Lucky
Labrador Corso
4 Weeks
Serious condition
0 found helpful
Serious condition

Has Symptoms

Loose motion vomiting

Medication Used

fluid from last 7days

Black stool from last three days.


Hi team,

From last 7days lucky is taking fluid only through doctor yesterday I requested doctor to do parvo virus test vet did the test through kit an confirm that lucky is not suffering from parvo virus vet suggested me to admit lucky to clinic i did the same today morning an doc call me evening an ask to take the dog he charge me a lot from the beginning an there is no result till now.

I am very much worried that lucky will survive or not after all she is just 40-45days baby.

Today evening I bring lucky back to home but there is no improvement vet an his team lie to me that in the day time lucky had eaten some chicken gravy along with little bit milk as well please suggest as of now my family member start presering me to leave lucky to some vet center which i don't want to do

Please please help me if there is any other way to help lucky

I would appreciate if you could suggest me in the same as vet doctor is still saying lucky is not suffering from parvo virus however all the symptoms indicate that lucky is suffering from parvo virus

Dr. Michele King, DVM
Dr. Michele King, DVM
1611 Recommendations
There are many viruses and intestinal conditions, and parasites, that can look like Parvo virus, and that need the same treatment as Parvo virus, which is intensive fluid therapy and hospitalization. If Lucky is going to survive, admitting him to the hospital may be the way to help him.

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Lucky
Labrador Husky
5 Weeks
Serious condition
0 found helpful
Serious condition

Has Symptoms

Black stool vomiting

Hi my 45 days lab her name is lucky stop eating any thing from last 6days an she started vomiting an blood in stool from last two days vet had done parvo virus test as well but vet inform that there is no parvo virus however I have consulted with another vet an he confirm that simtoms is of parvo virus from yesterday he is doing black stool heavily please suggest what to do I need hell asap

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
3320 Recommendations
Black faeces is an indicator of digested blood in the stool, there are many symptoms of parvovirus which are common with other infections so a diagnostic test is needed to confirm; however it is important that Lucky receives plenty of supportive care (fluids etc… for dehydration and antibiotics against secondary infections) but the specific underlying cause (infection, gastric ulcers, poisoning, foreign objects etc…) needs to be determined for treatment to be effective. Regards Dr Callum Turner DVM

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Guinness
Soft-Coated Wheaten Terrier
8 Months
Serious condition
0 found helpful
Serious condition

Has Symptoms

Rapid weight loss, lethargy

Our dog Guinness within two weeks was losing weight. The Vet did a blood exam on Guinness and results showed his kidney levels were at 7. It has been 3 days since Guinness has been hospitalized with IV fluids finally kidney levels went to 5.1. Today, Day four,doctors still have not found what is wrong. Doctors highly recommended internal medicine soon. I am desperately in need for answers. What do you advice my family to do. Dog parents. Thank you.

Dr. Michele King, DVM
Dr. Michele King, DVM
1611 Recommendations
I'm sorry that this is happening to Guinness at such a young age. I'm not sure which kidney value was elevated, as there are a few, but it seems that your veterinarian is focusing on his kidneys. If they have not been able to determine the cause of the problem, and are suggesting a referral to an internal medicine specialist, that would probably be the best thing to do for him. I hope that you are able to get answers, and that he recovers normally.

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Hey Hey
Boxador
7 Months
Fair condition
-1 found helpful
Fair condition

Has Symptoms

Black Stool

My dog likes to eat everything he finds. I recently noticed he has been pooping out the thing he has ate like coins, a bobby pin and even a necklace. We do stop him when we see it but he is very mischievous and sneaky. Has this hurt him internally?

Dr. Michele King, DVM
Dr. Michele King, DVM
1611 Recommendations
The things that he is eating may be harming him, yes. If he is passing black stool, he may be bleeding in his intestines. It would be best to have him seen by a veterinarian, as he may need medical treatment. You may also need to puppy-proof your house, as well, so that he isn't eating these things.

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Hachi
Pom chi
4 Weeks
Moderate condition
1 found helpful
Moderate condition

Has Symptoms

none

My 4 week old puppy just today started having black stool. We did change his food from non chicken flavored food to duck food and rabbit treats when he is training. I’m very concerned as to what had happened for him to have black stool. We changed the food he is eating 3 days ago. He had black stool 4 times and is acting completely normal. Does his change in food had anything to do with it?

Dr. Michele King, DVM
Dr. Michele King, DVM
1611 Recommendations
Black stools may be a sign that he is bleeding into his GI tract, and could be caused by parasites. It may be that the food change is causing his stool to be a different color, also. Without seeing him, it is difficult for me to determine whether he is having a problem, but it would be a good idea to have his stool assessed by a veterinarian for any signs of parasites, and blood. If either are there, they can treat the problem before it becomes more severe. I hope that all goes well for Hachi.

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Storm
Golden Labrador
17 Years
Critical condition
0 found helpful
Critical condition

Has Symptoms

Breathing Difficulty
bad breath
Breathing Difficulty. Black Poop

hi my dogs is pooping black and is having a heard time breathing.. he is over 17 years old and I cant afford a vet right now due to my husbands check because of his broken ankle.. what should i do??

Dr. Michele King, DVM
Dr. Michele King, DVM
1611 Recommendations
Sadly, without being able to examine Storm, I don't have any way of knowing what might be going on or a way to help treat him. If he is having difficulty breathing, he does need to be seen by a veterinarian, as he may have lung or heart disease and may need help. There aren't any home remedies for those things, unfortunately. Many clinics do offer a 'free first exam', or there may be a low cost clinic in your area that can help, as no veterinarian wants to see an animal suffer. I hope that Storm is okay.

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Baylee
English Bulldog
5 Years
Fair condition
0 found helpful
Fair condition

Has Symptoms

Black poop

My dog just had a mast cell tumor removed a week and a half ago. Her diet switched to canned food and we are transitioning back to dry (last 3 days). She is on Tramadol, Claritin, an antibiotic and another pain reliever. Tonight she had a solid bowel movement but it was black. Two hours later, she had another dark bowel movement but it was like mud. She is acting completely normal, any ideas of what is going on?

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
3320 Recommendations
Black tarry stool may be caused by a few different causes including dietary changes, medication side effects (some reports of black stools with tramadol) among other causes; keep an eye on the stool for the time being and call your Veterinarian when they open to discuss treatment and possible options. Regards Dr Callum Turner DVM

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