MRSA, dogs and other animals

Yes, dogs can get MRSA — usually from us. Staphylococcus aureus is a human-adapted bacterium. When it turns up in a pet dog or cat, the source is nearly always a person in the household who carries it in their nose or has an infected wound.

Animals can then act as a reservoir and pass it back to people, which is why repeated household infections sometimes only stop once the pet is checked too. Farm animals are a separate story: pigs, cattle and poultry carry their own adapted strain, known as livestock-associated MRSA.

Dogs are the animal people ask about most. A dog can be a silent carrier, with MRSA sitting in the nose or on the skin causing nothing at all, or it can develop an active infection where the skin barrier is broken.

• Wound and surgical site infections — an incision, neutering site or bite wound that stays red, swollen and discharging past the normal healing window.
• Pyoderma — pustules, crusting, circular hair loss and inflamed patches, often in skin folds or along the back.
• Ear infections — recurrent, smelly, itchy ears that keep returning after treatment.
• Deeper infections — rare, but bone, joint, urinary and post-orthopaedic infections do occur.

Important: carriage in a dog is usually transient. Unlike people, dogs are not a natural long-term host for S. aureus, and most clear it within weeks once the human source is treated and hygiene improves.

Most resistant staph infections diagnosed in dogs are not MRSA at all. They are MRSP — methicillin-resistant Staphylococcus pseudintermedius — the dog's own staph species.

The same principle applies in people, where resistant and non-resistant staph look the same on the skin — see MSSA vs MRSA and how MRSA is tested.

• Cats. Less commonly affected than dogs. Typical presentations are infected bite wounds, abscesses and post-surgical infections. Human contact is again the usual source.
• Horses. Well documented, especially in equine hospitals — surgical site, catheter and wound infections. Specific strains circulate between horses and the people who handle them, in both directions.
• Rabbits, birds and small pets. Occasional case reports; not a meaningful household risk.

Farm animals carry a genetically distinct branch of MRSA. The best known is clonal complex 398 — written CC398 or ST398 — which adapted to pigs and spread to veal calves, cattle and poultry across Europe and North America.

• The animals are rarely ill. Colonisation without disease is the norm in pigs and calves.
• Farm workers are the exposed group. Pig farmers, abattoir workers, veterinarians and their families carry LA-MRSA at rates far above the general population, largely through direct animal contact and farm dust.
• It causes the same infections in people — boils, wound and skin infections, and occasionally serious invasive disease — but has historically spread less readily person to person than hospital or community strains.
• Some countries screen on admission. In the Netherlands and Denmark, people with livestock contact are isolated and swabbed when they enter hospital.

How LA-MRSA fits alongside hospital and community types is set out on MRSA strains.

LA-MRSA has been detected on raw pork, poultry and beef in surveys, but food is not a recognised route of MRSA illness. Regulators treat it as a low risk handled by ordinary kitchen hygiene: wash hands and surfaces after raw meat, keep raw and cooked separate, and cook meat thoroughly. Pasteurisation deals with milk.

• Wash hands after handling your pet, its bedding, its food bowls and any wound.
• Keep your own wounds covered — this is the single most effective step at stopping human-to-pet transfer.
• Discourage face licking and shared beds while anyone in the house has an active infection.
• Wash pet bedding and towels hot, and clean food bowls daily.
• Take any non-healing, oozing or recurrent pet wound to a vet and ask for a culture rather than a repeat course of antibiotics.
• If human infections keep returning in a household with pets, tell your doctor and your vet — the animal may need swabbing as part of the picture.

Household hygiene is covered in more depth on MRSA at home and protecting your family, and repeated infections on why MRSA keeps coming back.

If you work with pigs, cattle, poultry or horses, you are in the highest-exposure group outside healthcare. Practical steps: change out of work clothing before going indoors, wash work overalls separately, shower after high-dust work, wear gloves for handling sick animals or wounds, cover your own cuts, and tell hospital staff about your animal contact before any admission or surgery.

General prevention advice, including decolonisation, is on the MRSA prevention hub.