Murphy and Ruska

I refer to my last week at work as the “Murphy and Ruska Show” in honor of two delightful patients who arrived at my doorstep one day apart, each with a life-threatening disorder called pneumothorax. “Pneumo” means air and “thorax” refers to the chest cavity, so “pneumothorax” is air within the chest cavity.  If you’re scratching your head wondering, “Isn’t there supposed to be air in the chest cavity?” here’s what you need to know.  While the lungs are air-filled, the space surrounding the lungs, known as the pleural space, is normally devoid of air.  Pneumothorax refers to the accumulation of air with the pleural space. In order to understand how a pneumothorax causes difficulty breathing, it helps to think of the chest cavity as an empty barrel into which the lung lobes expand as they inflate (like balloons filling with air).  The lungs readily inflate with minimal effort because negative pressure (a vacuum effect) normally exists within the pleural space.  Fill the pleural space with air and the negative pressure is disrupted resulting in more effort required for lung expansion.  Make sense?

Murphy and Ruska were both observed by their families to experience an abrupt onset of labored breathing. Murphy also became subdued, a marked deviation from his normal wiggly-waggly Labrador self and he was unwilling to lie down.  Clever Murphy figured out that lying down makes labored breathing even more of a struggle.  In addition to working extra hard to breathe the normally ravenous Ruska refused her breakfast, a sure sign that this sweet Shepherd was off her game.

Normal Chest

The two most common causes of pneumothorax are penetrating chest cavity wounds that allow external air to enter the pleural space and leakage of air from the surface of a diseased or injured lung lobe.  Pneumothorax is readily diagnosed with a chest x-ray.  Have a look at the accompanying normal and abnormal x-ray images. In both views, the dogs are lying on their sides with their head end to the left and their tail end to the right.  You can see the spines at the top of the images.  Note the heart, the whitish round structure in the middle of the chest cavity. Air shows up black on an x-ray. Now notice how much more black (air) there is surrounding the heart in the pneumothorax image compared to the normal chest. Makes you want to become a radiologist, eh!


Murphy and Ruska were referred to me to figure out why they had leaky lung lobes.  The most common cause of pneumothorax is a blunt blow to the chest cavity (hit-by-car trauma is classic) forceful enough to tear a lung lobe and allow leakage of air into the pleural space. Ruska and Murphy were both closely supervised with no known trauma history.  Computed tomography (CT scanning) is my test of choice for solving the mystery of the leaky lung lobe. Murphy’s scan revealed multiple small blisters (aka, blebs or bullae) on his lung lobe surfaces.  Just as in people with this abnormality the blisters are thin-walled and capable of spontaneous rupture allowing air to leak into the pleural space. Fortunately, as was the case with Murphy, most lung blisters are self-sealing within a few days. Worse case scenario, a stubborn leaker can be surgically sealed. Murphy’s family has been forewarned that his multiple blebs will likely mean multiple penumothorax episodes.  They know what to be watching for and will return with Murphy any time, day or night, should his labored breathing recur. Murphy is now home, happy as can be with instructions to be a couch potato for the next two weeks with hopes of avoiding disruption of the body’s “bandaid” on his leaky lung blister.

Ruska’s CT scan documented a small walled off abscess on the surface of one lung lobe.  Given the time of year and where Ruska lives and plays, I’d be willing to bet my first born child that a foxtail plant awn is living within that abscess.  Fortunately, Ruska’s lung lobe leak resolved itself, and the pros and cons of surgically exploring the site versus long-term antibiotic therapy (foxtails shuttle bacteria wherever they migrate) were discussed and are still being considered.  I should be hearing back from Ruska’s mom sometime this week.  For now, this big girl is back home and, like her friend Murphy, she is doing her best to be a cooperative couch potato (easier for a Shepherd than a Lab!).

Our emergency room vets are used to seeing pneumothorax patients because hit-by-car trauma is so prevalent.  As a small animal internist I rarely see them, yet here were two within one week! (I suspect the third is on its way.)  Have you or a loved one (human or canine) experienced a pneumothorax?  Please do tell.

Best wishes for good health,

Nancy Kay, DVM
Diplomate, American College of Veterinary Internal Medicine
Author of  Speaking for Spot: Be the Advocate Your Dog Needs to Live a Happy, Healthy, Longer Life
Recipient, Leo K. Bustad Companion Animal Veterinarian of the Year Award
Recipient, American Animal Hospital Association Animal Welfare and Humane Ethics Award
Recipient, Dog Writers Association of America Award for Best Blog
Recipient, Eukanuba Canine Health Award
Recipient, AKC Club Publication Excellence Award
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Please visit to read excerpts from Speaking for Spot. There you will also find “Advocacy Aids”- helpful health forms you can download and use for your own dog, and a collection of published articles on advocating for your pet’s health. Speaking for Spot is available at, local bookstores, and your favorite online book seller.

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7 Responses to “Murphy and Ruska”

  1. Dr. Tony Johnson Says:

    Thanks for sharing the interesting information on your two patients, Dr. Kay!
    When I was a resident, I remember thinking sadly to myself “I am a 2nd year resident and I have never put in a chest tube”. Sure enough, one night I had not one but TWO cases of spontaneous pneumothorax come in to the ER within an hour of each other! The coincidence blew me away, but I was able to scratch my chest-tube itch that day.

    Both patients did well and were able to go home, luckily. I learned a great deal from those cases.

    I also worked with an ER vet in Chicago who had himself experienced a spontaneous pneumothorax. He said the chest tube going in was the worst part of the whole ordeal, so I am extra careful to provide my chest tube patients with weapons-grade pain killers.

  2. Kyla Duffy Says:

    I always look forward to your posts, and again, you didn’t disappoint! I had never heard of pneumothorax before, and while this post didn’t inspire me to want to become a radiologist, I do feel smarter! 🙂 I’m glad the two pups are okay.

  3. Anne Dorley Says:

    I hope to God that never happens. Border Collies do NOT appreciate being babied and I already had to. I found out he had heart worm when I got him. I hope these guys recover promptly.


  4. Polly Cooper Says:

    I recall having pleurisy when I was fourteen – miserable lying down. As I recall, they taped me tightly -raionot tricuspid

  5. Margot Alice Says:

    My daughter was hospitalized for pneumothorax as a teenager. She had a bleb and the treatment was the same for her — rest and time. She is now thirty and has not had a recurrence. I hope that’s true for your canine patients! Question : how does foxtail migrate to the lung lobe area? What was the likely pathway that allowed it to form an abscess in that location?

  6. Catherine Fitch Says:

    The only case of (post) pneumothorax I have ever seen was a largish Italian Greyhound, Davey, who came to me in Rescue. I don’t do Rescue any more, as I got too old to pack up and run for three hours to get a dog out of a shelter.

    Anyway, the story I got was that Davey had been kicked by someone in his family so hard that his lung collapsed. There was a little black scar where the chest tube had been.

    Davey REALLY did not like men, so I sort of assumed that the kicker was the husband. I’ll bet he was mean to his wife and children, too. Once when we had a little three-year-old girl and her father over, the man picked up his little girl to go home, and Davey, who had been snuggling with the child and bringing her his toys, suddenly thought, “Hey! You are stealing my new friend!” and leaped up and bit the poor fellow on the rear.

    He was very nice about it.

    Davey was the only Italian Greyhound that I ever knew who bit, and one could only see his point.


  7. Michelle DuPont Says:

    Thank you for sharing such great information. I have two very active Golden Retrievers and they spend allot of time in the woods of New Hampshire and wrestling with each other. I often worry that they could cause some sort of internal injury that I would not realize until it is too late or more serious than it needs to be. My Mom suffered from pneumothorax, she had blisters on her lungs most likely from smoking for many years. I remember one day that she suffered an episode, the blister burst and punctured her lung/tore the lining. She had to be flown to Boston and was on life support until her lung could begin to heal itself. Knowing what she went through, I can not believe a dog having to go through that and not able to understand what is happening. Thank you for all the good information.

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