Skin Ulcers in Dogs: Causes, Treatment and Safe Home Care
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By Dr Duncan Houston
A raw patch on a dog's elbow, a sore that keeps reopening or a lump that starts bleeding can all be described as ulcerated skin. An ulcer means the skin's protective surface has been lost; it does not tell us why.
The immediate aims are to protect the area and keep your dog comfortable. Lasting improvement depends on identifying the cause, particularly when a sore appears without an obvious injury or fails to heal.
Quick Answer
Arrange veterinary assessment for an open skin ulcer, especially if it is painful, spreading, recurrent or associated with a lump. Prevent licking and avoid applying human creams, peroxide or leftover medication. Heavy bleeding, rapidly worsening tissue damage or an unwell dog requires urgent care.
Why dogs develop skin ulcers
Pressure over bony areas can damage skin in dogs with reduced mobility. Other ulcers begin with an injury, a burn, a bite or persistent licking. Infection may cause tissue damage or develop after the skin barrier breaks down.
Immune-mediated disease and some tumours can also produce ulcers. The pattern matters: a single sore over an elbow has different possibilities from multiple lesions around the lips, nose or genital region. A dog may lick because the area hurts or itches, so describing every sore as a behavioural problem can miss the cause.
As the Merck Veterinary Manual's skin diagnostic guidance explains, similar-looking lesions can arise from different diseases. Photographs help document change but cannot establish the diagnosis alone.
How urgently should my dog be seen?
| What you notice | What to do |
|---|---|
| Small, stable open sore; dog otherwise comfortable | Contact your clinic for a prompt examination and interim care advice. |
| Pus, increasing odour, swelling, pain or an ulcerated lump | Seek same-day advice; an examination and sampling may be needed. |
| Rapid spread, blackening tissue, marked weakness or severe pain | Seek urgent veterinary assessment. |
| Uncontrolled bleeding, collapse, major burn or serious trauma | Attend an emergency clinic immediately. |
How your vet investigates the sore
Bring the date you first noticed it, photographs, a medication list and details of previous treatments. Tell the vet whether licking started before or after the lesion appeared and whether other areas are affected.
Microscopic examination of material from the skin can identify inflammatory cells and organisms. Culture may help guide treatment where infection is suspected, particularly in deep, recurrent or previously treated lesions. A biopsy may be recommended for unusual, persistent or potentially immune-mediated or cancerous lesions. Your vet selects the sampling site; repeatedly scrubbing away crusts before the appointment can remove useful diagnostic material.
Further tests depend on the findings and your dog's overall health. A positive bacterial result does not necessarily explain what started the ulcer, and a non-healing wound is not automatically cancer.
Safe care while arranging the appointment
- Prevent licking. Use a correctly fitted protective collar if your dog tolerates it. Check that they can drink and rest safely.
- Ask before cleaning. If a fresh wound is visibly dirty, the clinic may advise a gentle rinse with sterile saline. Avoid vigorous scrubbing or removing attached tissue.
- Protect from further injury. Keep bedding clean and dry. Avoid rough play, swimming and contact with dirty surfaces.
- Leave dressings to a clear plan. Tight or wet bandages can create additional damage. Ask for a demonstration and a change schedule if bandaging is needed.
- Record changes. Take a dated photograph without delaying care, and note appetite, comfort, discharge and any new lesions.
The Merck wound management guidance describes saline as gentle on healing tissue and warns that hydrogen peroxide damages it. Removing dead tissue, choosing dressings and deciding whether a wound should be closed are veterinary decisions.
Emergency signs and first aid
Call ahead if your dog is weak, bleeding heavily or deteriorating rapidly. For accessible external bleeding, hold steady pressure with a clean cloth while arranging transport, provided this is safe. Pain can make a normally gentle dog bite. Do not spend time cleaning a wound when your dog needs emergency stabilisation.
Treatment and follow-up
Treatment may include prescribed pain relief, professional wound care, pressure relief and medication directed at the underlying disease. Antibiotics are selected when indicated; they are not a universal treatment for every ulcer. Immune-suppressing medicines require a diagnosis and monitoring, rather than a trial with tablets left from an earlier illness.
Ask what improvement should look like and when to return. There is no single healing timetable. Increasing size, new pain, a slipping dressing or repeated reopening should trigger reassessment.
Common mistakes
- Letting the dog lick the wound to clean it.
- Cutting away scabs or dark tissue at home.
- Applying concentrated antiseptic, essential oils or human pain-relief products.
- Repeatedly changing creams without investigating a persistent sore.
Preventing recurrence
For a dog with limited mobility, ask for an individual plan covering padded bedding, assisted movement, repositioning and skin checks. Keep urine-soiled bedding from contacting damaged skin. Address itch, pain and mobility problems that make licking or prolonged pressure more likely.
Frequently Asked Questions
Is every ulcer infected?
No. Infection is one possibility, and it can also complicate another condition. Examination and sampling help distinguish these situations.
Can a tumour look like a wound?
Yes. Some growths ulcerate, which is one reason a recurring or non-healing lesion may need a biopsy.
Should an ulcer always have a bandage?
No. Location, moisture and the cause influence that decision. Use the dressing plan your vet recommends.
Can I use leftover antibiotics?
No. They may be unsuitable and can make subsequent investigation harder. Contact your vet for a current treatment plan.
Protecting the sore matters, but understanding why it developed is what guides effective care and reduces repeated setbacks.
ASK A VET™ can help you organise your concerns and questions before your dog's examination.
