Finding a lump on your dog can be frightening.
Your mind may immediately jump to the worst possible explanation, but lumps can develop for many different reasons. Some are harmless, while others need prompt investigation or treatment.
Unfortunately, you cannot reliably identify a lump by looking at or feeling it at home.
The safest approach is to record what you have found and arrange for your veterinarian to examine it.
Here’s what every dog owner should know.
Are Lumps Common In Dogs?
Lumps and bumps are relatively common, particularly as dogs get older.
They can develop on the skin, beneath the skin or within deeper tissues. Possible explanations include:
• Fatty lumps
• Cysts
• Warts
• Inflammation
• Abscesses
• Reactions to bites or stings
• Foreign material beneath the skin
• Benign growths
• Malignant tumours
These can sometimes look or feel very similar. Even an experienced veterinarian may need to collect cells or tissue before identifying a lump.
Finding one does not automatically mean your dog has cancer, but every new lump should be assessed.
What Should You Do When You Find A Lump?
Try to remain calm and avoid repeatedly pressing or squeezing the area.
Instead, gather information that may help your veterinarian.
1. Record Its Location
Write down exactly where you found the lump.
Descriptions such as “near the front leg” can be difficult to interpret later, especially if your dog has a thick or long coat.
You could record that the lump is:
• Behind the left shoulder
• On the right side of the chest
• Beneath the collar
• Near the base of the tail
• Between two toes
• On the underside of the abdomen
Taking a wider photograph showing its position on your dog’s body can also help you find the same area again.
2. Measure The Lump
Use a ruler to record its approximate length and width.
If the lump is difficult to see beneath the coat, photograph the area with a ruler beside it. Avoid placing unnecessary pressure on the lump.
Do not rely on memory alone. Small changes can be difficult to recognise without a starting measurement.
3. Take A Clear Photograph
Photographs allow you and your veterinarian to compare the area over time.
For the most useful image:
• Use good natural light
• Keep the camera focused
• Include a ruler or another consistent size reference
• Take one close photograph
• Take another showing the location on your dog’s body
A photograph cannot diagnose the lump, but it creates a helpful record.
4. Note When You Found It
Record the date you first noticed the lump.
You may not know exactly when it developed, particularly if your dog has a thick coat. That is okay. Write down when you first became aware of it and whether you think it appeared suddenly.
5. Check For Other Changes
Without squeezing or repeatedly handling the lump, note whether it appears:
• Soft or firm
• Smooth or irregular
• Attached to the skin
• Moveable beneath the skin
• Painful when touched
• Warm or swollen
• Hairless
• Red or discoloured
• Ulcerated or bleeding
• Associated with discharge
These observations may help your veterinarian, but none can confirm whether a lump is harmless or serious.
Should You Wait To See If It Disappears?
It is best to contact your veterinarian rather than waiting without guidance.
Some lumps may remain unchanged for years, while others can grow or change quickly. Appearance, texture and growth rate do not always provide a reliable diagnosis.
Your veterinarian can advise how soon the lump should be examined based on:
• Your dog’s age and health
• The lump’s location
• How quickly it appeared
• Whether it is changing
• Whether your dog has other symptoms
Early examination may provide more options if treatment is required.
Why You Cannot Diagnose A Lump By Touch
A soft, moveable lump may be a benign fatty growth, but not every soft lump is harmless.
Likewise, a firm lump is not automatically cancerous.
Different conditions may have similar:
• Shapes
• Textures
• Colours
• Growth patterns
• Locations
Veterinarians often use a cell or tissue sample to learn what a lump contains.
The common phrase “if it is soft and moveable, it is fine” should not replace a professional assessment.
What Will The Vet Do?
Your veterinarian will usually begin by asking:
• When you first noticed the lump
• Whether it has changed
• Whether your dog is licking or scratching it
• Whether it appears painful
• Whether your dog has developed other symptoms
• Whether similar lumps have been examined previously
They will then perform a physical examination and assess the lump’s size, position and characteristics.
Further investigation may be recommended.
What Is A Fine Needle Aspirate?
A fine needle aspirate involves placing a small needle into the lump to collect cells.
The cells can then be examined under a microscope, either at the veterinary clinic or by a pathology laboratory.
This procedure may help identify what type of cells are present. However, the sample is small and may not always provide a complete answer.
If the results are unclear, your veterinarian may recommend another test.
What Is A Biopsy?
A biopsy involves removing a larger tissue sample or, in some cases, the entire lump.
The tissue is sent to a pathology laboratory, where its structure can be examined in greater detail.
Your veterinarian will explain the most appropriate option based on the lump’s size, location and initial test results.
Should You Try To Remove Or Treat It At Home?
No.
Do not:
• Squeeze or puncture the lump
• Attempt to drain it
• Cut it open
• Tie anything around it
• Apply human wart treatments
• Use essential oils
• Apply medicated creams without veterinary advice
• Give your dog human pain medication
Attempting to treat a lump at home may cause pain, bleeding, infection or delay an accurate diagnosis.
When Should You See A Vet?
Arrange a veterinary appointment for any new or previously unexamined lump.
Contact your veterinarian sooner if the lump:
• Is growing
• Changes shape or colour
• Becomes firm or fixed in place
• Is painful
• Begins bleeding or leaking fluid
• Develops an open surface
• Interferes with walking, eating or toileting
• Is repeatedly licked or scratched
• Returns after previously being removed
• Appears between the toes, in the mouth or around an eye
Previously assessed lumps should also be rechecked if they change.
When Is A Lump More Urgent?
Seek prompt veterinary advice if your dog has a lump and also:
• Appears lethargic or weak
• Stops eating
• Loses weight unexpectedly
• Has difficulty breathing
• Develops a swollen abdomen
• Experiences persistent vomiting or diarrhoea
• Has pale gums
• Shows significant pain
• Collapses
A rapidly developing swelling around the face or throat accompanied by breathing difficulties may indicate a severe allergic reaction and requires emergency care.
Make Lump Checks Part Of Your Routine
Regular checks can help you notice changes early.
Once a month, gently run your hands over your dog’s body, including:
• Around the head and neck
• Beneath the collar
• Along the chest and abdomen
• Under the front legs
• Around the groin
• Along the back and sides
• Around the tail
• Down each leg
• Between the toes
Performing the check in the same order each time makes it less likely that you will miss an area.
This is also a useful habit after hiking, camping or spending time in long grass, when ticks, grass seeds and minor injuries may be hidden beneath the coat.
Keep A Record Of Existing Lumps
If your dog has multiple lumps, create a simple record for each one.
Include:
• A number or name
• Its exact location
• The date it was found
• Its measurement
• A photograph
• Veterinary test results
• Any changes you notice
A body map can be particularly helpful for older dogs that develop several lumps over time.
Early Checks Provide Clarity
Finding a lump does not tell you what it is.
Rather than assuming the worst or deciding it is harmless based on how it feels, record what you have found and arrange an appropriate veterinary examination.
Early investigation can provide reassurance, identify problems that need treatment and establish a baseline for future monitoring.
At Paws & Peaks, we believe every adventure is safer when preparation comes first. Because the best memories are made outdoors, and every dog deserves to come home safely.
