Why Does My Dog Have a Swollen Belly?

Updated on February 26, 2019
DrMark1961 profile image

Dr. Mark is a small animal veterinarian. He works mostly with dogs and exotic animals.

A dogs swollen belly can indicate a serious problem.
A dogs swollen belly can indicate a serious problem. | Source

Your dog should not have a big belly. If she does, and it has been happening gradually, it may just be caused by fat and can be dealt with at home by putting her on a good diet.

If you notice that your dog has a swollen belly, especially if the abdomen is painful, she is eating less, having problems breathing, and also has a thin face or muscle loss in other parts of the body; get help from your vet as soon as possible.

If your dog is in pain do something right away. A swollen and painful belly is an emergency!

Reasons Your Dog Might Have a Swollen Belly

  • Obesity
  • Pregnancy
  • Cancer
  • Heart Disease (like heartworm, heart failure due to severe dental disease) Parasites
  • Poisoning
  • Obstipation (late stage constipation)
  • Urinary obstruction/stones
  • Hormonal (like Cushings)
  • Torsion (a twisted stomach, liver, or other organ)
  • Pyometra (an infected and swollen uterus in a female dog that has not been spayed)
  • Other infection (like peritonitis, hepatitis, etc.)

Sometimes a swollen belly in a dog can indicate a life threatening condition.
Sometimes a swollen belly in a dog can indicate a life threatening condition. | Source

Tests That Your Vet Might Perform If Your Dog Presents With a Swollen Belly

If the physical exam in abnormal, and the vet can tell that the dog is not just fat, pregnant, or suffering from a torsion, the side of the belly will be clipped and scrubbed before a needle is inserted. If fluid is present a small amount will be drawn off and examined under the microscope.

The thickness (specific gravity) of the fluid will be evaluated. It will be checked for white and red blood cells, bacteria, and any other abnormalities.

Based on the results, your dog may also have his abdomen (and chest) x-rayed and then might need an ultrasound, an EKG, or even exploratory surgery and a biopsy.

A swollen belly may be from gastric torsion and your dog will need emergency surgery.
A swollen belly may be from gastric torsion and your dog will need emergency surgery. | Source

How Will Your Dog Be Treated If He Comes in With a Swollen Belly?

Treatment is going to depend on what was found during the dog´s exam and testing.

  • For cancer (lymphoma), your dog might be put on chemotherapy, or you can discuss some alternative treatments for cancer.
  • If your dog is having trouble breathing because of the fluid and heart failure, it might be drained off and then your dog can be started on medications.
  • If the heart failure is secondary to heartworm disease, that will have to be treated too. I recommend the slow kill method, but some veterinarians will want to destroy the worms by killing them all at once.
  • Surgery for bloat, other types of torsion, pyometra, urinary obstruction, and maybe for obstipation
  • Your dog might need to be on supportive care (like fluids and hospitalization) until the cause of the problem is determined, like in cases of peritonitis.
  • If your dog is in distress because of breathing problems, the fluid might be drained off and then he can be treated with antibiotics for the hepatitis or other infection/inflammation.

A Swollen Belly Is an Emergency

A swollen belly might not seem like much, but it is one of the most serious problems you can find during your examination of your dog. Your dog may or may not get better. It really depends on the cause of the swollen belly and how quickly you find out what is wrong.

Your vet can give you a better idea on whether your dog is going to get better after the problem has been determined. Getting thing taken care of right away might mean the difference between life and death.

If you ignore the problem, your dog might end up dying in terrible pain. Find out what is wrong, and do something about it right away.

If your dog is in pain, get help!

This article is accurate and true to the best of the author’s knowledge. It is not meant to substitute for diagnosis, prognosis, treatment, prescription, or formal and individualized advice from a veterinary medical professional. Animals exhibiting signs and symptoms of distress should be seen by a veterinarian immediately.

Questions & Answers

  • My dog has a swollen round belly, but as his belly gets bigger, his spine and ribs begin to show more; he definitely has alot of muscle loss but is acting completly fine, eating fine, etc. Im starting to get worried about him. What could be wrong?

    There is no way that your dog can be diagnosed without an exam. If he has a large belly and is losing weight, he may have a heart disease, like heartworm. Is he on a preventative?

    You need to take your dog to your local vet for an exam. If he has fluid on the abdomen, they can take a sample and may be able to tell you if your dog has cancer, etc.

  • My dog has a swollen belly, rapid breathing and eats a small amount only. What should I do? (I have no time to bring him to a vet since I'm on daytime shift.)

    Your dog might have pyometra (a uterine infection), peritonitis, etc. There is no way that anyone can diagnose her problem over the internet. If you cannot take her to the vet for an exam, please ask someone you know to take her.

  • I have a Labrador, and he is just forty-five days old. His stomach is a little big; no signs of pain or anything and he is so active. Why is his stomach large?

    The most common cause for a very large abdomen on a puppy is parasites. Has your dog been checked for worms? If not, take a stool sample to your vet and have it checked.

    It is also possible that it is just a normal puppy stomach. At that age a large stomach is okay. Ask your vet when you take him in for his first vaccinations.

  • My dog's belly goes from normal to hard and is causing him discomfort. Been to vet 2x all his vitals and blood work came back good this afternoon. He got excited and wanted a walk, so I put on his harness; he walked 20ft, and he sat down. His stomach got hard, and I had to carry him in. What could be causing this?

    Has your dog had x-rays of his belly taken? It sounds like a torsion, but I would expect the pain to be constant unless it is relieving itself and then happening again later.

    If the x-rays are normal, the next step would be an ultrasound. If that is normal too the only other way to diagnose this is by a diagnostic surgery.

  • What if I can't take my dog to the vet when he is laying down and looking bloated and in pain?

    If you do not want to take your dog to the vet because you are too busy or think it will cost too much, you should be aware that your dog might not live the rest of the night. If he has a twisted stomach or another organ, there is not much you can do at home.

    If you cannot go to a vet because there is none available, like in some countries, you can try going to a feed store that sells animal antibiotics and treating the dog for an infection like pyometra. I do not know what antibiotics are available at the feed stores where you live so I cannot recommend which one you should buy. You can also try giving your dog activated charcoal to bind any poisons still in his GI tract.

© 2014 Dr Mark


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    • DrMark1961 profile imageAUTHOR

      Dr Mark 

      3 months ago from The Atlantic Rain Forest, Brazil

      Regina, has your puppy been checked numerous times for parasites? Worms are the most common reason for a swollen stomach in dogs of that age.

    • profile image

      Regina phillips 

      3 months ago

      I have a 4 month old American Pitbull and she is updated on her shots, but she has a really large abdomen. I’m concerned although she is very active, she is eating extremely well, drinking water, and also pooping and peeing with no problems. She shows no signs of pain. Why is her stomach so big?

    • profile image

      Aruna madhushan 

      7 months ago

      My dog is 2 month old.last day it pink of health.last night it bark in pain.after it's stomach is big and his legs are not work.what happend it?how can i get back normally?

    • profile image


      7 months ago

      I have a 10 year old english bulldog. His belly has been bloates for weeks now and wont go down. This has happened before i changed his food a d it went down. This time it is not..no real symptoms are obvious just discomrt because his belly is so big.

    • profile image

      Penny Stojcevski 

      8 months ago


      I have a beautiful shep lab corso mix. She really looks like a cute little black lab. 60 ish pounds. She’s intact. I was really convinced two weeks ago (give or take) that she was having a phantom pregnancy. Her nipples got big, she got moody with my other dog Charlie whom is her bestest pal. They’ve grown together. Any who I recognized the signs in her. But never noticed a heat at all. Charlie is neutered but he still ties with her. And this never happened after the whole phantom pregnancy thing. No period nothing. I thought after she realized that these would resume normally. Now I noticed like a week maybe less ago that her abdomen seems harder than norm. I thought am I losing my mind?... I thought hmm maybe she’s constipated or something. I ted to panic so I was trying to rationalize before I really freak out. Which is happening now! Omg. But her abdomen is looking distended to me. She’s peeing and pooping and playing. She even got into my fridge while I was at work. So she’s her usual sassy self. I’m worried though. She’s my sweet Elektra and I love her. I’m going to take her in Monday when my vet opens.

    • DrMark1961 profile imageAUTHOR

      Dr Mark 

      8 months ago from The Atlantic Rain Forest, Brazil

      Michael, I am not sure where you are at but you might want to find out what the cost for treating a distended abdomen costs at your local hospital. The hospital does not do any more than the vet.

      If you want to learn why prices are high you can read https://pethelpful.com/dogs/why-vet-care-is-expens...

    • profile image

      michael thompson 

      8 months ago

      if vets dint charge such extortionate prices for treatment,some might be willing to go there. but its rediculous what they charge for how little they do.

    • DrMark1961 profile imageAUTHOR

      Dr Mark 

      9 months ago from The Atlantic Rain Forest, Brazil

      Jacky, a senior dog with a swollen belly needs to be examined and probably have xrays. There is always the possibility that it is cancer, even if the signs go away for awhile. Liver disease and kidney disease should also be considered.

      I am glad that Buddy is not in pain when you mess with his stomach. He still should be checked out as soon as possible though.

    • profile image


      9 months ago

      Hello. My senior dog, Buddy, had gotten so skinny and stopped eating for awhile. It wasn't until a week ago when he started eating again, however, two days ago I noticed that his stomach is very round now and im starting to get worried. He's been eating very well everyday so I don't want to assume its something bad. He also doesn't have pain when I touch his stomach.

    • DrMark1961 profile imageAUTHOR

      Dr Mark 

      16 months ago from The Atlantic Rain Forest, Brazil

      Serene, have you taken her in to your local vet for blood work? With those symptoms, you need to consider diabetes mellitus, Cushings, cancer, kidney disease, or even a chronic infection. Have a CBC and blood chemistry run after getting a good physical exam for her.

    • profile image


      16 months ago

      Hi there,

      My mutt is 7 1/2 years old and only this last week has stopped eating her food and has started drinking more. She is normal in every other aspect of her life! Happiness, eating treats, going for walks, sleeping, no pain, no whimpering. Just thirsty, won't touch her dog food and is feeling way too boney everywhere, except her belly. She eats grass in the summer and has had constipation issues before. Any ideas as to what might be her issue???

    • DrMark1961 profile imageAUTHOR

      Dr Mark 

      16 months ago from The Atlantic Rain Forest, Brazil

      Hi Michelle sorry I do not know of anyone up in Ontario that I can refer you to. Unfortunately that answer may be close, or it may take a lot more testing. If you feel that badly, ask for your dogs records and look for another vet (board certified in internal medicine-ACVIM). The original visit may cost more, but it may end up costing less. I with you and your Boston the best .

    • profile image


      16 months ago

      Hi. I have a 7 year old boston terrier. He has a swollen belly.. losing muscle mass as well. Sleep a lot and drinks excessively. We have had him tested for cushings... negative. Blood work shows high liver enzymes. They say no to diabeties. Now they want an ultra sound. I'm worried the vet doesn't know much. I have copies of all the blood work I was going to take him elsewhere. I just don't know what to do but all these 400 dollar tests are adding up quickly.

    • profile image


      19 months ago

      I've been getting him black walnut and a diurex he's eating a lot better but still real blodded

    • profile image


      2 years ago

      Dr. Mark, Thank you for the advise. I don't know if it makes any difference now. She did get blood chemistry done as well as x-ray. By the time she became blind, they did want to do an ultrasound.

      Depressing and bad news, but I put her to sleep March 13th. This was one of the most devastating thing I had to do and the first dog I had to put to sleep. It would have been nice to know what was wrong with her.

    • DrMark1961 profile imageAUTHOR

      Dr Mark 

      2 years ago from The Atlantic Rain Forest, Brazil

      Jake, the blindness with the swollen belly indicates a systemic problem. What does the blood chemistry panel show? What kind of results did you get from the CBC? If you have not done a panel yet, but have been to 3 different vets, you are wasting your time and money running around. How about x-rays? Have the vets tapped the stomach and evaluated the fluid, if any? Is she spayed?

    • profile image


      2 years ago

      Took my dog to 3 different vets to see why her stomach is distended. She doesn't have cancer, does not have bloat. Her stomach has been like this going on 3 months. She still eats, drinks and goes bathroom. The ONLY problem I noticed is that she has gone blind.

    • Bob Bamberg profile image

      Bob Bamberg 

      5 years ago from Southeastern Massachusetts

      Too many pet owners find something amusing about an overweight dog: "Boy, he's a little porker, ain't he?" They may not take a distended abdomen seriously until the dog is in serious condition. This is an informative way to remind people that a big belly isn't something to be trifled with. Voted up, useful and interesting.

    • DrMark1961 profile imageAUTHOR

      Dr Mark 

      5 years ago from The Atlantic Rain Forest, Brazil

      That is really funny, Barbat, and I guess he would be classified as "normal variation". Some dogs are known to swallow air as they eat and drink, but that is great that you can burp him and he feels better. Is this an adult JRT? It sounds like something one of my puppies would do!

    • profile image


      5 years ago

      One dog of mine gets so thirsty he drinks too fast and then his belly appears to be swollen. I discovered that I needed to burp him! He even thanks me afterward! and then has room for more water, food etc. I pat the sides of his belly gently and then gently push up on the underside of his belly and out comes a huge burp...or after patting his sides, he puts his paws on my leg (positioning him in an upright or standing on two legs position) and out come the burps! Ever hear of a dog swallowing air as they drink?

    • JayeWisdom profile image

      Jaye Denman 

      5 years ago from Deep South, USA

      Here's one more thing you may want to consider if your dog's belly seems swollen but ONLY if the dog doesn't appear to be in pain. A dog may develop a belly that appears swollen, but is actually "potbellied", one of the symptoms of canine Cushing's Disease. The reason I'm aware of this is because my dog (though she doesn't have this symptom) recently had pre-op lab tests that indicated she may have Cushing's. She's currently had another set of tests the results of which were not definitive and she's scheduled for all-day blood tests March 27. (Her surgery had to be postponed.) Meanwhile I've immersed myself in veterinary-based articles about the disorder.

      Other symptoms of Cushing's include: excessive thirst and urination; increased appetite; weakness of hind legs; skin and coat problems; muscle weakness and lethargy. A dog with Cushing's may not exhibit all or even most of these symptoms and those he/she has may be so subtle the pet parent only considers them a sign of aging. (Cushing's usually affects dogs that are middle-aged or older.) The "potbellied" look, combined with the increased appetite, may seem to be merely encroaching obesity.

      I'm certainly not making light of the potential of bloat or any obstruction posing danger to the dog's life. Just thought I'd interject another possibility if the dog's tummy looks like the illustration at the beginning of the article., especially if it happened gradually. Of course, growth of a tumor may be gradual as well, so any change in the dog's appearance should be checked out by a veterinarian. Much better to be cautious.

      However, I agree with Dr. Mark that a dog presenting with a sudden swollen belly needs to be examined by a vet asap! There's no time to delay getting the help your dog needs.

      Voted Up, Useful, Interesting and shared.


    • Solaras profile image


      5 years ago

      It was heart breaking, and they treated her with Baytril that gave her a seizure, and I spent a fortune on them thumping her to try to improve her lungs since they thought it was pneumonia. That was and $1800.00 bill for an overnight stay at the emergency clinic.

    • DrMark1961 profile imageAUTHOR

      Dr Mark 

      5 years ago from The Atlantic Rain Forest, Brazil

      What a sad story, Solaras. If a dog is presented with a swollen belly, part of the workup should also be an x-ray of the chest, and if the dog has chest problems there should always be an x-ray of the abdomen. The only time the vet should not do this is if the client is unwilling to pay for the x-ray. (That happens more than you might think.)

      It sounds like there was nothing to do for the tumor, but, as you point out, she could have suffered less if it was diagnosed correctly from the beginning.

    • Solaras profile image


      5 years ago

      Great article. When my girl had a swollen belly, they misdiagnosed her with pneumonia. I told them to x-ray her abdomen, but they ignored me at the emergency vet. It turned out to be hemangiosarcoma, and she was gone within 30 hours from noticing something was not right to being put down to end her suffering. She had a 3" diameter tumor in her heart.

      Thumbs up and useful!

    • Bk42author profile image

      Brenda Thornlow 

      5 years ago from New York

      This. Is great information. Thanks so much for sharing. Voted useful!


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