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Dogs Don't Get Heart Attacks, But They Do Get This
April 20, 2015 (published)

There are all sorts of pluses and minuses to the world of veterinary medicine when compared to human medicine, but in one area veterinarians come up clear winners: In all but the most vanishingly rare situations, dogs don’t get heart attacks.

Dogs almost never develop the same sort of hardening of the arteries, known as atherosclerosis, that makes middle-aged men and women clutch their chests, drop the 3-wood and shuffle off this mortal coil. Human medicine has all the shiny toys, insurance money and human-life-is-so-important stuff going for it that it makes veterinarians green with envy, but I thank my lucky stars every day that I don’t have to deal with heart attacks.

The canine equivalent, at least in my opinion, is probably a phenomenon known as ‘spontaneous hemoabdomen' even though it is not related to coronary artery disease. Your average veterinary ER probably sees two or three of these types of cases a week, and as the pet population ages they are bound to become even more common.

The thing about hemoabdomen cases that makes them so frightening for pet owners is that they seem to come out of nowhere, and they hit like a random, unforeseen lightning strike on an otherwise sunny day - like a human heart attack. One moment their dog may be happily cavorting in the yard, and the next they’re lying on a gurney in a veterinary ER fighting for their lives.

In most cases, a tumor on the spleen, which may have been growing for weeks in the abdomen without being detected, ruptures and starts to hemorrhage internally. This condition is called hemangiosarcoma. Dogs can bleed to death within a few hours if the bleeding continues unchecked. They can be quite literally felled in their tracks.

The bleeding is internal, and there is no evidence of bleeding that can be seen externally by the pet owner. All they know is that their dog was fine one minute, then collapsed and couldn’t get up the next. No blood in the stool, none in the urine, none anywhere; just a big pool of blood building up inside the abdominal cavity. Blood that should be circulating and bringing oxygen to tissues is suddenly settling in the abdomen. Shock and low blood pressure set in almost immediately.

The signs are typically a sudden onset of weakness and inability to get up. These can happen in any breed of dog, but the majority are in dogs that share a genome with German Shepherds. Golden Retrievers, sadly, probably take the number two spot. Any dog over eight years old that’s related to a German shepherd or Golden is potentially at risk for a spontaneous hemoabdomen, and this disease should be considered in any dog of this type who has a sudden episode of unexplained weakness. Check their gums, as they are often as white as a sheet during this event.

In about three quarters of the cases, the ruptured mass on the spleen is due to an aggressive malignancy called a hemangiosarcoma, a really nasty cancer that grows out of blood-forming organs (the spleen is a tongue-shaped, flat organ that sits on the left side of the abdomen, all snuggled up to the kidneys and other giblets). Hemangiosarcomas love to grow rapidly, spread to other parts of the body and, worse, they usually eat powerful chemotherapeutic drugs for lunch. It is just a miserable type of cancer to have, and most patients with them are not around for long, even with a full-court press of medical intervention. I hate diagnosing hemangiosarcoma because it usually means I have just pronounced a death sentence for a patient.

For that lucky one out of four that doesn’t have a hemangiosarcoma, they likely have a benign and slow-growing tumor called a hemangioma that just decided to break open and start bleeding (we keep the names similar to confuse the tourists). These, fortunately, can be completely cured through surgery. You still have to deal with all that life-threatening hemorrhage and accompanying scariness, but at least you get good news when the biopsy comes back.

The survival rate for dogs with hemangiosarcoma after emergency surgery to stop the bleeding is, on average, about three months. That time span can be doubled with the help of powerful chemotherapy, which is an option that all owners should be offered. We tend to not be as aggressive with chemo for our pets as they are with people, so that can mean fewer side effects. For some folks, six months of good quality life is a blessing, while for many that is nowhere near enough to justify the medical high-wire act that must happen to even hope for a little survival. The word ‘cure’ is almost never uttered in the same sentence as the word ‘hemangiosarcoma.’

Many owners decide to not pursue surgery when we make the diagnosis of hemoabdomen, and I can’t blame them. They are usually looking at a 75% chance that their dog has a disease that will very likely kill them inside of 90 days. The alternative is a fast and painless euthanasia, or, in some special cases, a death at home. Despite all the drama of this disease, it is usually totally painless and I will honor requests to take pets home to die if the owners are educated about what may happen. For those that elect to pursue treatment (I would say about one-third to one-half of owners opt to treat), the goal is to take them to surgery as soon as they are stabilized. This means blood transfusions and other methods to try and make them the best anesthesia candidate we can, quickly.

All of this comes at owners with dizzying speed. I am often in the unenviable position of trying to get them to make a timely decision on a very expensive, delicate matter with little information and no guarantees. Unfortunately, lengthy Q&A sessions in the middle of this type of crisis only makes the prognosis grow more dim for the patient as their lifeblood seeps into their abdominal cavity. I have had patients go from the front door to the surgery suite in under an hour, and sometimes with only the briefest of introductions of myself to the pet owner.

However, I recognize the need for people to feel that they have made the best and most informed decision that they can in this scenario. I try to answer as many questions as time permits for the patient, and steer them to make a decision if we start covering the same ground repeatedly. I want to note one important point right here. This is an excruciatingly difficult point in the lives of pet owners, and it becomes a critical juncture for me to talk to the owners, hear their concerns, and help them make the best decision we all can, given the imperfect information we have on hand. Unfortunately, in this case the patients simply don’t have time for anything but a rapid decision.

The cost for surgery and ICU aftercare can easily run into the thousands (many will hit the $5,000 mark before discharge), and many will have post-op complications that can escalate that amount.

I had one case several years back where post-op complications kept the dog in the hospital for a week, at a cost of over $10,000. The biopsy came back shortly after discharge and was what we all feared worst: hemangiosarcoma. The dog, owned by a very nice and caring physician, lived for another month before the cancer grew back and caused more bleeding. For most of us, $10,000 for another month of life would never fit the budget (or, for some people, their concept of what is right), but for this man, he assured me it was the best month he ever had with his dog. They hiked, they fished, they lounged on the couch eating Doritos and drinking Yoo-Hoo. They did everything but go 2.7 seconds on a bull named Fu Manchu. They lived like the dog was dying, and got everything out of it they could. He was happy with his initial decision and told me, as I put his dog to sleep, that he would have made it again.

For a bad outcome, that’s a pretty good way to look at it.


Molly Jari
January 9, 2017

Thank you for this article and all the information you share.  Also to everyone who writes in with their experience.  I am constantly looking for any new information on hemangiomasarcoma. My dog was dx with a 10 cm splenic mass 16 months ago - assumed HSA. She was almost 12 at the time and like Sara (April 2016 post) chose not to try the surgery for splenectomy.  My dog is doing amazingly well. below is a link to our blog if you're interested in how we are working with diet, herbals, exercise and homeopathy to support her health.  I realize every case is different and do not want to imply that we have found a cure, we have not, but there may be some support here if your dog is still living with hemangioma - sarcoma or any other cancer.

November 20, 2016

I came across this article when doing a search for why a dog with hemoabdomen would code under anesthesia. I am a certified vet tech, having graduated from Tech school in 2007. I've run anesthesia thousands of times and have never had one code during. Until this weekend. It was an 11y, MN, Golden. Everything was going good until it wasn't. He presented recumbent, and dx with hemoabdomen. Fluids were bolused, pre-med given, intubated, scrubbed, then he went agonal. The cause of hemorrhage could not be found, but mets were everywhere. I understand that he was level 5 surgical risk, but it stills troubles me that this happened.

April 17, 2016

My dog was diagnosed with a splenic mass in November 2014. I looked into the options and decided to take him home with no medical interventions.  He is still here. Now I wish I had done the surgery as it must be benign, but a year and a half later I just can put Him through this surgery at 12. A very difficult situation.

April 22, 2015

What a great spot on article- so well written. I've come to expect nothing less of Dr Tony Johnson. Incredibly intelligent educator- I "stalk" him on  VIN. His sense of humor goes a long way too. Thanks for a fantastic article on a horrid disease.

Renee M 
April 21, 2015

I've dealt with a hemangiosarcoma of the heart. . only reason we caught it was he had pneumonia. . .a horrid horrid freaking disease

Linda Baitz 
April 21, 2015

I lost 3 furry daughters within 14 months, Jan 2014-March 2015, all over 15 yrs old, the last, a Siberian huskie on her 16th b-day.  When it was our shitzu's time we took her to her dr. and he told us he thought that we would have been back within a month of her tumor removal,7 months prior,  because it was such a nasty looking cancer. I am glad he didn't tell us because we wouldn't have not let her live like nothing was wrong.  She went about her day being the boss of all of us and being her loveable bratty self.

Mike Fuller 
April 21, 2015

We just had to put down Kalie a 13 yr old love of our lives. My better-half Marti is a vet and retired, she gave me the bad news just as the vet who was treating her came in with the same news. We had 13 yrs with a wonderful friend. RIP my love

Connie Moore 
April 21, 2015

My dog Wiggles a 12-year-old male Pekingese was unfortunate to have a splenic mass that weighed 1.3 pounds taken from his body that turned out to be his histiosarcoma.  He is now on chemotherapy taking lomustine and has been doing well although lately we've had about swear he doesn't like to eat and he got a little sick a week ago but is slowly recovering I'm fortunate enough to work in a veterinary emergency clinic where I can provide chemotherapy for my dog at a discounted rate but I totally understand where that doctors coming from he is our baby and we will keep him here with us until he tells us it's time for him to go and at that point I hope to bring him home and do the same thing make him leave his final days like there's no tomorrow we love him so much.


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