Managing Your Pet's Pain and Comfort Through Cancer

Owners sometimes assume pain relief is something you do "at the end". It isn't. A pet who's comfortable eats better, sleeps better, moves more and stays interested in the things they love, and all of that is what we mean by quality of life. Pain control is the foundation the good days are built on. That's just as true if you've decided not to pursue treatment for the cancer itself, because choosing comfort-focused care is not "doing nothing" and it's certainly not giving up. It's the active, skilled job of keeping your pet feeling well, and good pain management is the heart of it.

The first step is spotting it, and pets rarely make it obvious. They don't tell us where it hurts. Pain shows up as small changes in how they behave, and you, who know your pet best, are usually the first to notice that something is just a bit off.

In dogs the signs are a little easier to read: reluctance to climb stairs or jump into the car, slowing on walks, stiffness getting up, trouble settling, panting that doesn't fit the weather, a hunched back, or simply a dog who's quieter and less themselves. Some become clingy, others withdraw, and a normally gentle dog may grumble when touched on a sore spot.

Cats are the real challenge, and this is the part that catches owners out. Cats are hardwired to hide weakness, so a cat in real discomfort will often look, to a casual glance, almost normal. The signs are quieter and easy to write off as "just getting old". This is exactly why it pays to know what to look for.

Subtle signs of pain, especially in cats

Cats hide pain well, so watch for the quiet changes rather than any dramatic one:

• Hiding away more than usual, or retreating to a quiet spot and staying there
• Grooming less (a scruffy, matted or greasy coat is a common clue), or over-grooming one particular area
• A hunched, crouched posture, sitting tense even at rest, or sleeping curled tighter than normal
• Eating less, or going to the bowl and then walking away
• Not jumping up to favourite perches any more, or hesitating on the stairs
• A change in temperament, becoming grumpy or snappy when touched, or unusually withdrawn and flat
• Facial changes, squinted eyes, flattened ears and whiskers pulled tight, the things the Feline Grimace Scale measures

Any of these on their own can be nothing. A cluster of them, or a clear change from your cat's normal self, is worth a vet's attention.

That last point is backed by real science. Researchers at the University of Montreal developed and validated the Feline Grimace Scale, which reads pain from five facial features (ear position, eye narrowing, muzzle tension, whisker position and head position) (Evangelista et al., 2019), and a follow-up study found it reliable enough that cat owners can use it too, not just vets (Evangelista et al., 2021). If you'd like a simple checklist for the fridge, there's a [pain-signs download] you can print, with the dog and cat signs side by side.

When it comes to actually relieving the pain, modern veterinary practice doesn't rely on a single drug. The principle, set out in the profession's pain-management guidance, is "multimodal" analgesia, which means layering several treatments that work in different ways so each can be used at a gentler dose, with better relief and fewer side effects than any one drug pushed to its limit (Gruen et al., 2022). Think of it as a stack rather than a single pill.

Your vet will usually build that stack from a few familiar building blocks (Gruen et al., 2022):

• Anti-inflammatory painkillers (NSAIDs), such as meloxicam, carprofen or robenacoxib, are often the backbone, especially where there's inflammation or bone involvement. They work well, but they need the right dose for the right pet, which is one reason the human versions in your cupboard are dangerous (more on that below).
• Opioids, such as buprenorphine or methadone, for stronger or breakthrough pain. These are prescription medicines used carefully, often around procedures or when pain is harder to settle.
• Gabapentin, a nerve-pain medicine that's become a mainstay because it's easy to give by mouth, mixes well with other drugs, and helps with the gnawing, nerve-type pain some tumours cause.
• Adjuncts such as amantadine, layered in when pain is stubborn or has become "wound up" over time.

Cancer pain is genuinely underrecognised and undertreated in animals, partly because it's so easy to miss, so don't be shy about reporting it. If your pet seems sore, say so, and say so again if a plan isn't working (Williams & MacDonald-Dickinson, 2023). Pain relief is something to adjust and fine-tune, not set once and forget.

This is the single most important warning in this whole piece, so it gets its own section. Do not give your pet painkillers from your own medicine cabinet. Not to "tide them over", not at a guessed-down dose, not the children's liquid version. The advice from veterinary specialists is unambiguous: never give human medication to your pet unless your vet has specifically told you to (Willows Veterinary Group).

Two examples show why this matters so much.

Paracetamol can kill a cat. Cats lack the liver enzyme that lets people and dogs safely process paracetamol, so it builds up into toxic byproducts that damage their red blood cells and stop their blood carrying oxygen, as well as harming the liver (MSD Veterinary Manual). The signs are grim: brown or muddy gums, a swollen face or paws, laboured breathing and collapse. And the dose that does it is tiny. A single 250mg tablet can be fatal to a cat (Willows Veterinary Group). One tablet. There is no safe amount of paracetamol you can give a cat at home.

Ibuprofen is toxic to both dogs and cats, causing stomach ulcers and kidney damage at doses far lower than people assume. A single 200mg tablet can poison a cat or a small dog, and cats are harmed at roughly half the dose that affects a dog (Willows Veterinary Group; MSD Veterinary Manual). Aspirin and naproxen carry the same kind of risk.

If your pet has somehow swallowed any of these, treat it as an emergency and ring your vet straight away rather than waiting to see what happens. And there's no need to take the risk at all, because your vet has pet-safe painkillers that work, and getting the right one is a phone call away.

Medicine does the heavy lifting, but a lot of comfort comes from small, ordinary changes at home, which matter all the more for a pet whose mobility or energy is fading.

• A thick, soft bed in a warm, draught-free spot, low enough to climb into without a struggle.
• Easy access to everything that matters, so food, water and (for cats) a low-sided litter tray are close by and don't need stairs. Raising bowls slightly eases a stiff neck.
• Warmth, which soothes aching joints, and a gentle, predictable routine, which lowers anxiety.
• Quiet and calm, a retreat away from children or other pets, and the steady reassurance of your company, which is its own kind of pain relief.

Some cancers cause a particular kind of pain that benefits from targeted help. Bone tumours, for instance, are intensely painful, and there are good options beyond daily medication. A short course of palliative radiotherapy can ease bone pain in around three-quarters of dogs, with relief often lasting a couple of months or more, and is given purely for comfort rather than cure (Ramirez et al., 1999; Rancilio et al., 2022). Medicines called bisphosphonates can also help with bone pain and strengthen weakened bone. If a tumour is causing pain through a fluid build-up or pressure, draining it for comfort can bring quick relief too. These are options worth asking about, and you can read more in [radiation therapy for pets].

The way to be sure the pain plan is doing its job is to keep watching the same things over time rather than judging by a single day. Tracking your pet's comfort and good days alongside their other quality-of-life signs turns a daily guess into something you can actually see and act on, and we've got a whole piece on [measuring quality of life] and a tool to help you do it.

For a long stretch, good pain control buys exactly what comfort care is for: more genuinely good days. There may come a point where, despite everyone's best efforts, pain or decline can't be held comfortably any more, and recognising that is part of loving your pet too. You won't be on your own with it when you get there. We cover [the signs the cancer is winning] gently, and [the quality-of-life decision] when it comes, with our whole End-of-Life space alongside.

For now, though, the message is a hopeful one. Pain is the thing we can almost always do something about, and doing something about it today is one of the most loving things you can give your pet.