Seromas in Dogs After Surgery: Causes, Signs, and What to Expect

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Recovering from surgery can be stressful for both dogs and their owners. One of the most common post-operative concerns I’m asked about is swelling near the surgical site, particularly seromas. While they can look alarming, seromas are usually a normal part of the healing process—especially after orthopaedic procedures.
As a physiotherapist, I see seromas regularly in clinical practice. I’ve also experienced this firsthand with my own dog, Frankie, who is now four weeks post bilateral stifle surgery for luxating patella. This article explains what seromas are, when and why they occur, and when you should be concerned.

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What Are Seromas in Dogs?

A seroma is a collection of clear fluid (serum) that builds up under the skin following surgery or trauma. This fluid is part of the body’s natural inflammatory and healing response.
In dogs, seromas typically:

• Feel soft or squishy to touch
• Appear near a surgical incision
• Are usually painless
• Are not infected

Although they can look concerning, seromas are not the same as infections or abscesses.

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When Do Seromas Occur After Surgery?

Seromas most commonly develop 7–14 days after surgery, but they can appear earlier or later depending on the dog and the type of procedure performed.
They are particularly common after:

• Orthopaedic surgery (TPLO, TTA, luxating patella surgery)
• Larger or more invasive procedures
• Bilateral surgeries (both limbs operated on)
• Surgeries involving significant tissue movement

In Frankie’s case, having both stifles operated on at the same time meant more surgical trauma and inflammation, increasing the likelihood of fluid accumulation.

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Why Do Seromas Form?

Seromas form when there is dead space beneath the skin after surgery. During an operation, tissues are separated and small blood and lymphatic vessels are disrupted. As healing begins, fluid naturally leaks into these spaces.
Factors that increase the risk of seroma formation include:

• Too much movement too early in recovery
• Licking or irritation around the incision
• Larger dogs or dogs with looser skin
• Limited post-operative compression or support

Even with excellent post-operative care, seromas can still occur—they are often simply part of the normal healing process.

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What Does a Seroma Look and Feel Like?
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A typical seroma will:

• Appear as a soft swelling near the incision
• Change size throughout the day
• Feel cool or normal to touch
• Cause little to no discomfort

Seek veterinary advice promptly if the swelling becomes painful, firm, red, hot, or begins to ooze fluid, as this may indicate infection or another complication.

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Do Seromas in Dogs Need Treatment?

In most cases, seromas do not require active treatment and will gradually resolve on their own over several weeks as the body reabsorbs the fluid.
Management usually focuses on:

• Strict rest and controlled activity
• Avoiding jumping, running, or rough play
• Preventing licking (Elizabethan collars are important)
• Compression bandaging if advised by your veterinarian

Draining a seroma is generally avoided unless absolutely necessary, as repeated drainage can increase the risk of infection.
Frankie developed a noticeable seroma during her recovery, which was understandably worrying at first. With time, reduced activity, and careful monitoring, it has slowly improved—something I often reassure my own clients about.

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How Physiotherapy Can Help

Canine physiotherapy plays an important role in managing swelling and supporting safe recovery after surgery.
Physiotherapy can help by:

• Improving circulation and lymphatic drainage
• Reducing excessive swelling
• Guiding safe, controlled movement
• Preventing stiffness and muscle loss

The key is doing the right amount of exercise at the right stage of healing—too much, too soon can worsen swelling.

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When Should You Be Concerned?

You should contact your veterinarian if:

• The swelling is rapidly increasing
• The area becomes hot, painful, or red
• Your dog appears lethargic or unwell
• There is discharge from the incision

If you’re ever unsure, it’s always best to check.

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Final Thoughts

Seromas are a common cause of swelling after dog surgery, particularly orthopaedic procedures. While they may look dramatic, they are usually a temporary and normal part of healing.
Having gone through this recovery journey with Frankie has reinforced just how important reassurance, education, and appropriate rehabilitation are. Recovery is rarely a straight line, but with patience and the right support, progress does happen.

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Disclaimer: This blog is intended for educational purposes only and does not replace veterinary advice. If you have concerns about your dog’s recovery or post-surgical swelling, please consult your veterinarian or a qualified canine physiotherapist.

Author

Joanna Whitehead
Joanna is a qualified physiotherapist and the owner of Canine Kinetics, providing evidence-based physiotherapy to support dogs recovering from surgery, injury, and mobility-related conditions.