Dog Lump Or Bump
Finding a new lump on your dog can be scary. Many skin masses are benign, but some need prompt testing, so this guide will help you understand common causes, warning signs, and when to call your vet.
When to call a vet for a lump or bump
Go to the ER now
- ● Go to an emergency vet right away if the lump is causing trouble breathing, especially if it is on the face, nose, or throat area.
- ● Seek emergency care if the lump is rapidly swelling and your dog also seems weak, collapses, vomits repeatedly, or has pale gums.
- ● Go now if the lump is badly bleeding and you cannot control the bleeding with gentle pressure.
- ● Get urgent emergency help if the area is severely painful, hot, and swollen and your dog seems very sick, lethargic, or feverish.
See a vet within 24 hours
- ● Schedule a veterinary exam within a day or two for any new lump or bump, even if your dog seems normal.
- ● Call your vet promptly if the lump is growing, changing shape or color, feels firm or irregular, or becomes red, ulcerated, or starts oozing.
- ● Book a visit soon if the lump seems painful, bothers your dog, or is located on the mouth, paw, eyelid, ear, or another spot that affects normal function.
- ● Have your dog seen promptly if there are multiple new lumps, enlarged lymph node areas, or if your dog is acting unwell along with the mass.
Watch at home, call if it worsens
- ● If your vet has already examined the lump and advised monitoring, keep a close watch for any change in size, texture, color, or comfort.
- ● Take a photo and measure the lump with a ruler so you can track it accurately between appointments.
- ● Monitor for licking, scratching, bleeding, discharge, or sudden swelling and call your vet if any of these happen.
- ● Do not assume a soft or movable lump is harmless, but if it is unchanged and your vet has recommended watchful waiting, follow that plan and recheck as advised.
Common Causes of Dog Lump Or Bump
Lipoma
Lipomas are benign fatty masses that are common in dogs, especially older dogs. They are often soft and movable under the skin, but they still should be checked because some cancers can look similar.
Cysts
Follicular or sebaceous cysts can appear as round nodules on or under the skin. Some may contain thick material and can become inflamed or infected if they rupture.
Abscess or infection
A painful swelling can happen after a bite wound, puncture, or skin infection. These lumps may feel warm, grow quickly, and sometimes drain fluid or pus.
Warts and benign skin growths
Papillomas, skin tags, and some histiocytomas can form raised bumps on the skin. Some benign growths are more common in younger dogs, but appearance alone is not enough to diagnose them.
Mast cell tumor
Mast cell tumors are a common malignant skin cancer in dogs and can look like many different kinds of lumps. They may be red, swollen, ulcerated, or change size over time.
Trauma-related swelling
A bump can form after injury, bruising, or a reaction at an injection site. Some swellings improve with time, but a lump that persists, grows, or changes should be checked by your vet.
What to Do at Home
If you find a lump or bump on your dog, try not to panic—but do take it seriously. Many masses are not emergencies, but there is no reliable way to tell what a lump is just by looking at it or feeling it. Your best next step is to document what you find and arrange a veterinary exam, especially if the lump is new or changing.
- Check the size, location, color, and whether the lump feels soft, firm, fixed, or movable.
- Take a clear photo and measure the lump with a ruler so you can monitor for change.
- Prevent your dog from licking, chewing, scratching, or rubbing the area.
- Do not squeeze, pop, puncture, or try to drain the lump at home.
- Keep the area clean and dry if the skin surface is irritated, but avoid applying creams or medications unless your vet tells you to.
- Call your vet sooner if the lump grows quickly, bleeds, ulcerates, becomes painful, or your dog seems unwell.
Frequently asked questions
When should I worry about a lump on my dog?
Are dog lumps always cancer?
Can I tell what my dog's lump is by touching it?
Should I pop or squeeze a cyst or lump on my dog?
What will my vet do for a lump or bump on my dog?
Disclaimer: The information provided in this article is for educational purposes only and does not constitute veterinary medical advice. Reading this content does not establish a veterinarian-client-patient relationship. Every pet is different — always consult a licensed veterinarian before making decisions about your pet's health, diet, or care. If you'd like personalized guidance, you can talk to one of our vets. If your pet is experiencing a medical emergency, contact your local emergency animal hospital immediately.