Negative Pressure Wound Therapy for Dogs: Advanced Healing Technology

Based on peer reviewed veterinary research · For educational purposes only · Updated October 2026 · 8 min read

What Is Negative Pressure Wound Therapy for Dogs?

Negative pressure wound therapy (NPWT) is a veterinary wound treatment in which an open wound is packed with a special foam, sealed under an airtight film, and connected to a pump that applies controlled suction, usually around -125 mmHg, to remove fluid and promote healing. It is widely known by the nickname "wound vac" or by the term vacuum-assisted closure (VAC).

The technique was developed in human medicine in the 1990s. Foundational experiments in pigs showed that sub-atmospheric pressure applied to wounds increased local blood flow about fourfold and increased the rate of granulation tissue formation by roughly 63% with continuous suction and 103% with intermittent suction, compared with control wounds (Morykwas et al., 1997).

Veterinary surgeons adopted the approach in the following decade. Case series and controlled studies in dogs now describe its use for traumatic wounds, degloving injuries of the distal limbs, surgical site complications, and skin grafts (Ben-Amotz et al., 2007; Pitt & Stanley, 2014).

NPWT is not a first-aid device or something used at home. It is applied under sedation or anesthesia in a veterinary hospital, usually after the wound has been cleaned and dead tissue has been removed.

How Does a Wound Vac Help Dog Wounds Heal?

NPWT works through several overlapping mechanisms. The most obvious is exudate removal. Large open wounds can produce a lot of fluid, and that fluid carries bacteria and inflammatory enzymes that slow healing. Suction continuously draws it away into a sealed canister, which also reduces how often the dressing must be changed.

The second mechanism is edema reduction (reduction of tissue swelling). By pulling excess interstitial fluid out of the tissue, suction improves local circulation and delivery of oxygen and nutrients. The third is microdeformation. The foam compresses slightly into the wound surface, and the resulting mechanical stretch on cells stimulates cell division and new blood vessel formation.

Together these effects encourage a healthy bed of granulation tissue, the red, cobblestone-textured tissue that fills a wound before skin can cover it. In a controlled experimental study in dogs, NPWT was associated with earlier granulation tissue formation during the first week of healing compared with conventional bandaging (Demaria et al., 2011).

The sealed dressing also helps keep the wound in a moist, protected environment, consistent with the moist healing principles covered in our guide to moist vs dry wound healing in dogs.

Which Dogs Are Candidates for NPWT?

NPWT is generally reserved for wounds that are too large, deep, contaminated, or irregular to close primarily or to manage easily with standard bandages. Common indications in dogs include degloving injuries of the lower limbs (where skin is torn away, often after a car accident), large bite wounds, open fractures with soft tissue loss, and wounds left after removal of large masses.

In a retrospective series of 45 dogs, NPWT was used for traumatic wounds, surgical wound complications, and to support grafts, and was generally well tolerated, with complications that were mostly minor and related to maintaining the seal (Pitt & Stanley, 2014). A series of 15 dogs with distal extremity wounds reported rapid development of a granulation bed ready for closure or grafting (Ben-Amotz et al., 2007).

Free skin grafts are another key use. NPWT holds the graft firmly against the wound bed and removes fluid that would otherwise lift it off. In an experimental study in dogs, grafts treated with NPWT showed better early adherence and less necrosis than grafts under conventional bolster dressings (Stanley et al., 2013).

NPWT is not appropriate for every wound. It is generally avoided over exposed major blood vessels, untreated bone infection, cancerous tissue, or wounds with extensive dead tissue that has not been debrided.

How Do Veterinarians Apply and Monitor NPWT?

Before NPWT is placed, the wound is typically clipped, lavaged, and debrided to remove dead tissue. A sterile open-cell foam is cut to fit the wound, sometimes with a non-adherent contact layer beneath it. The foam and surrounding skin are covered with an adhesive film, and a small opening in the film connects to tubing that runs to the pump.

Most protocols use about -125 mmHg, applied continuously or intermittently. Once suction starts, the foam should visibly contract and feel firm, which confirms an airtight seal. Maintaining that seal on a moving, furry patient is one of the main practical challenges, especially on joints, the tail, and around the anus, and leaks are the most common reason for alarms and early dressing changes (Pitt & Stanley, 2014).

Dressings are usually changed every 48 to 72 hours, often under sedation. At each change the veterinarian reassesses the wound, performs further debridement or lavage if needed, and decides whether the bed is ready for surgical closure, a skin graft, or a flap. Many dogs need several cycles over one to two weeks. Hospitalization is common, although some clinics use portable units.

When comparing NPWT with other advanced dressings, veterinary surgeons consider cost, the dog's temperament, the wound's location, and availability of equipment.

Signs of Problems During or After Wound Vac Treatment

While your dog is on NPWT, the veterinary team monitors the device, but owners of dogs on portable units, or dogs recovering after treatment, should know the warning signs. Loss of seal is the most frequent issue. If the foam softens and re-expands, or the pump alarms repeatedly, the wound is no longer under therapeutic suction and the team needs to know promptly.

Other concerns include bleeding into the tubing or canister, a strong or foul odor, redness or blistering of the skin under the adhesive film, fever, lethargy, or loss of appetite. Skin under adhesive drapes can become irritated or macerated (softened by moisture), particularly with repeated dressing changes.

After NPWT ends and the wound is closed or grafted, the usual postoperative rules apply: prevent licking with an e-collar or recovery suit, keep the site clean and dry, and attend recheck appointments. Our guide to wound dehiscence in dogs explains the signs that a closed wound is starting to reopen. If you notice a new skin lesion elsewhere and are unsure what it is, the Dog Skin Condition Checker can help you describe it for your veterinarian.

Long-Term Skin Care After Advanced Wound Treatment

Once a large wound has healed, the new skin and scar tissue are more fragile than normal skin. Scar tissue typically regains only about 70% to 80% of the original tensile strength of skin, and it often has fewer hair follicles and glands. Protecting the area from friction, sunburn on sparsely haired skin, and repeated trauma helps it mature.

Dogs that needed NPWT often spent days under bandages and adhesive drapes, and some have underlying conditions that contributed to poor healing. Surface bacterial overgrowth on the surrounding skin, and in skin folds or areas that stayed damp under dressings, is common during recovery. Your veterinarian may recommend medicated bathing once incisions and grafts are fully healed and cleared for washing.

Chlorhexidine Shampoo contains chlorhexidine gluconate, a cationic antiseptic that binds to and disrupts bacterial cell membranes and leaves residual activity on the skin surface, together with ketoconazole to address Malassezia yeast. It is an FDA-registered OTC veterinary drug listed on DailyMed, and it is used on intact, healed skin, never on an open wound or a fresh graft. A 10-minute contact time before rinsing lets the actives work. The bacterial skin infections in dogs page describes the signs that surface infection may be developing.

Finally, if a dog needed advanced wound therapy because a wound would not heal, ask your veterinarian whether underlying factors such as endocrine disease, poor nutrition, or infection were investigated. Our article on the four stages of wound healing in dogs explains where healing can stall.

Frequently Asked Questions

What is a wound vac for dogs?

A wound vac is negative pressure wound therapy: foam is placed in the wound, sealed with an airtight film, and connected to a pump that applies about -125 mmHg of suction to remove fluid and stimulate granulation tissue.

How long does a dog stay on a wound vac?

Many dogs need several dressing cycles over about one to two weeks. Dressings are typically changed every 48 to 72 hours until the wound bed is ready for closure or a skin graft.

Is negative pressure wound therapy painful for dogs?

Most dogs tolerate the suction well once it is running. Dressing changes can be uncomfortable, so they are usually done under sedation with pain relief.

How much does NPWT cost for a dog?

Cost varies widely by region and wound. It is generally more expensive than conventional bandaging because it requires a pump, special dressings, repeated sedation, and often hospitalization, so ask your clinic for an estimate.

Sources

1. Morykwas MJ, Argenta LC, Shelton-Brown EI, McGuirt W. Vacuum-assisted closure: a new method for wound control and treatment: animal studies and basic foundation. Annals of Plastic Surgery. 1997;38(6):553-562.
2. Demaria M, Stanley BJ, Hauptman JG, et al. Effects of negative pressure wound therapy on healing of open wounds in dogs. Veterinary Surgery. 2011;40(6):658-669.
3. Pitt KA, Stanley BJ. Negative pressure wound therapy: experience in 45 dogs. Veterinary Surgery. 2014;43(4):380-387.
4. Ben-Amotz R, Lanz OI, Miller JM, Filipowicz DE, King RE. The use of vacuum-assisted closure therapy for the treatment of distal extremity wounds in 15 dogs. Veterinary Surgery. 2007;36(7):684-690.
5. Stanley BJ, Pitt KA, Weder CD, et al. Effects of negative pressure wound therapy on healing of free full-thickness skin grafts in dogs. Veterinary Surgery. 2013;42(5):511-522.

Related Reading

• Granulation Tissue in Dog Wounds: Healthy Healing vs Proud Flesh
• The Four Stages of Wound Healing in Dogs: What Happens Under the Skin
• Wound Dehiscence in Dogs: When Surgical Incisions Open and What to Do

E. Maddens

Founder of Vetified. Develops topical antifungal and antimicrobial formulations for companion animals. Vetified products are listed on DailyMed and manufactured through FDA-registered facilities in the United States.

Research basis: All Vetified content references peer reviewed research published in journals including Veterinary Dermatology, JAVMA, and Journal of Small Animal Practice.