Finding a lump on a dog produces an immediate jump to the worst conclusion, and most of the time the worst conclusion is wrong. Fatty lumps, cysts, warts and reactive swellings are all common, particularly in middle-aged and older dogs.
What is not reasonable is deciding at home which kind you have. Benign and malignant lumps can feel identical, and the only way to know is to look at the cells.
Find them before they find you
Run your hands over the whole dog once a month, slowly, with the dog lying down and relaxed. Neck, chest, armpits, along the spine, belly, groin, legs, between the toes, around the tail, and inside the ears and mouth if your dog tolerates it.
This takes three minutes and it is the same handling routine that finds ticks, grass seeds, cuts and sore spots. A dog taught to accept it as a puppy makes the whole thing trivial.
Keep a simple map: a note on your phone with a rough body sketch, the position of each lump, its size in millimetres and the date you first felt it. Measuring beats memory every time.
What to record
- Where exactly, described so someone else can find it
- How big, measured rather than compared to fruit
- How it feels: soft or firm, smooth or irregular
- Whether it moves freely under the skin or feels stuck to what is underneath
- Whether the skin over it is normal, red, ulcerated or weeping
- Whether the dog reacts when you touch it
- The date, and a photograph with a coin beside it for scale
When to be seen quickly
Book the same week, not next month, if a lump is growing noticeably, is firm and fixed to deeper tissue, is ulcerated or bleeding, appeared suddenly, sits on a limb or a toe, or if your dog is also losing weight, off its food or lethargic.
Swellings that need attention today rather than this week: a rapidly enlarging swelling, a hot painful one that could be an abscess, anything interfering with breathing, eating or walking, and a swelling under the eye, which often means a tooth root abscess.
What the vet will do
Usually a fine needle aspirate: a small needle takes a sample of cells, which is examined under a microscope. It is quick, needs no anaesthetic in most cases, and frequently gives an answer the same day or within a few days.
If the sample is inconclusive, or the appearance is concerning, the next step is a biopsy or removal with analysis of the whole lump. Ask what each step will tell you and what it costs, and ask specifically whether the result would change the plan.
"Let us watch it" is a legitimate answer for a lump that has been sampled and is benign. It is not a substitute for sampling a lump nobody has examined.
The common types you will hear named
Lipomas, soft fatty lumps under the skin, very common in older and overweight dogs, usually harmless and occasionally removed if they interfere with movement.
Sebaceous cysts and warts, small, often on the head and legs, frequently in older dogs.
Mast cell tumours, which matter because they can look like anything, including a small soft lump that changes size from week to week. This is the single best argument for sampling rather than watching.
Abscesses and reactive swellings, often after a bite, a thorn or a grass seed, hot and painful rather than firm and painless.
In older dogs, keep it proportionate
An eleven-year-old labrador may have six lipomas, and mapping them is what makes the seventh one visible. That is the value of the record: not anxiety about each lump, but the ability to say with certainty that this one is new.
Tell whoever handles your dog regularly. A groomer, a walker or a sitter has hands on the animal often, and a note that a new lump was felt behind the elbow, with the date, is the kind of thing owners usually discover months later.
General information for dog owners in Luxembourg, not veterinary or legal advice. For your own dog, ask your vet, a qualified behaviourist or your commune. How this journal is written and checked.
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