🩺 Recognising Illness Early
Dogs cannot tell you they feel unwell — and they are remarkably good at hiding it. Learning to read the subtle early signs, knowing what can wait and what cannot, and trusting your instincts could one day save your dog's life.
🐾 Why Dogs Hide Illness
The most important thing to understand about canine illness is that dogs are genetically programmed to conceal it. In the wild, an animal that shows weakness becomes a target — for predators, for rivals within the pack. This instinct runs deep. A dog can be in significant pain, carrying a serious infection, or experiencing early organ failure while still greeting you at the door, eating its meals and appearing to function normally.
This is why "wait and see" can be dangerous. By the time most dogs show unmistakable, obvious signs of illness — refusing all food, unable to stand, crying out in pain — the condition has often been developing for days or longer. The dogs that do best are those whose owners noticed subtle early changes: a slight reduction in enthusiasm, a small shift in routine, an almost imperceptible change in posture. You know your dog better than anyone else does. That knowledge is a genuine clinical asset.
🔬 The single most important principle: You are not looking for dramatic signs of illness. You are looking for changes from your dog's individual normal. A usually bouncy dog being slightly quieter is more significant than a naturally calm dog being calm. Knowing your dog's normal baseline — their typical energy, appetite, thirst, sleep patterns and bathroom habits — is the foundation of early illness recognition.
🚦 Three Levels of Urgency
Not every sign of illness requires an emergency rush to the vet — but some cannot wait at all. Understanding which symptoms fall into which category prevents both dangerous under-reaction and unnecessary panic.
Monitor Closely
- Single episode of vomiting, no other symptoms
- One bout of loose stools, eating normally
- Slightly quieter after unusual exercise
- Mild reduction in appetite for under 24 hours
- Occasional sneezing
- Mild paw licking
- Slightly increased thirst on a hot day
Call Your Vet Today
- Vomiting more than twice in 24 hours
- Diarrhoea persisting beyond 24 hours
- Refusing food for more than 24 hours
- Marked increase or decrease in thirst
- Limping that doesn't ease with rest
- Persistent coughing or sneezing
- Eye or ear discharge
- New lump or swelling
- Unexplained weight loss
- Straining to urinate or defecate
- Noticeable behaviour change lasting 48+ hours
Emergency — Go Now
- Difficulty breathing or laboured breathing
- Retching without producing vomit
- Pale, white, grey or blue gums
- Collapse or inability to stand
- Suspected poisoning
- Seizures or convulsions
- Severe uncontrolled bleeding
- Eye trauma or sudden vision loss
- Swollen, hard, distended abdomen
- Loss of consciousness
- Signs of extreme pain
If you are unsure which category a symptom falls into, phone your vet practice and describe exactly what you are seeing. Most UK practices have nurse triage available and can advise over the phone whether your dog needs to be seen immediately. It is always better to call and be reassured than to wait and miss a critical window.
🔍 The Subtle Signs Most Owners Miss
These are the changes that appear before the obvious symptoms — the early whispers before the alarm sounds. None of these alone necessarily demands immediate action, but any combination, or any of these persisting beyond 48 hours, warrants a call to your vet.
Changed Energy or Enthusiasm
Not refusing to move — just slightly "off." Less excited at walk time, slower to get up, quicker to lie down during play. Often the very first sign of an underlying problem, hours or days before anything obvious appears
Eating Differently
Eating more slowly than usual, leaving food they normally finish instantly, eating on one side of the mouth only, or showing interest then walking away. Dental pain, nausea and systemic illness all show up here first
Thirst Changes
Drinking noticeably more or less than usual. Increased thirst is associated with diabetes, kidney disease, Cushing's disease, uterine infection (pyometra) and steroid medication. Decreased thirst can signal nausea or pain
Toilet Habit Changes
Urinating more or less frequently, straining, accidents indoors after being reliably housetrained, unusually pale or dark urine, very loose or very hard stools. The consistency, colour and frequency of bowel movements tell a detailed health story
Posture and Movement
Holding a leg slightly differently, favouring one side when getting up, being reluctant to jump onto furniture they normally bound onto, a subtly hunched back, or standing stiffly. Dogs hide limb pain by redistribution — look at the whole body
Behaviour Changes
Becoming more withdrawn, unusually clingy, irritable when touched in a specific area, or out of character aggressive. A friendly dog that flinches or snaps when you touch a certain area is telling you that area hurts
Breathing Changes
Breathing faster than usual at rest, breathing with effort, panting without obvious cause (heat or exercise), or a new nighttime cough. Respiratory rate at rest should be under 30 breaths per minute — higher than this consistently warrants a vet call
Coat and Skin
A dull, dry or unkempt coat in a dog that normally grooms itself. Flakiness, unusual shedding, new bald patches, repeated licking of one spot, or skin that looks thickened or discoloured. The coat reflects systemic health — thyroid, adrenal and nutritional problems all show here
✋ The Two-Minute Weekly Body Check
A systematic weekly check during a quiet moment — perhaps during grooming — catches many problems that would otherwise go unnoticed for weeks. It also builds your familiarity with your dog's normal, so deviations become obvious.
Gums and mouth
Lift the lips and check gum colour. Healthy gums are moist and salmon pink (though some dogs have natural dark pigmentation). Press your finger firmly on the gum — it should go white, then return to pink within two seconds when you release (capillary refill time). Pale, white, grey, yellow or blue gums are serious warning signs. Also check for tartar, swollen gums or any obvious tooth abnormalities.
Eyes
Both eyes should be bright and clear with no discharge, redness or cloudiness. A small amount of clear discharge on waking is normal. Yellow, green or excessive discharge is not. The whites of the eyes (sclera) should be white — yellowing suggests jaundice. Check that both pupils are the same size and both eyes are equally open.
Ears
Sniff inside each ear — healthy ears have a mild, neutral odour. Any yeasty, sweet or rotten smell indicates infection. Look for redness, swelling, dark discharge or excessive wax. Check whether your dog flinches when you gently handle the ear flap. Head shaking, scratching at ears and ear odour together are a reliable indicator of otitis that needs veterinary treatment.
Skin and coat — run your hands all over
Work from head to tail, running your fingers through the coat and pressing gently on the skin. You are feeling for lumps, bumps, sore spots that cause flinching, unusual heat, swelling or any abnormal texture. Pay particular attention to the area around the neck, armpits, groin and behind the knees — common locations for lymph nodes which swell during illness — and along the spine and ribcage.
Abdomen
Gently feel the belly — it should be soft and your dog should not react with concern when you press lightly. Tensing, flinching, a hard or distended abdomen, or obvious pain when touched are all causes for concern. A swollen, tight belly in a large or deep-chested breed is a potential GDV (bloat) emergency — see below.
Legs and paws
Run your hands down each leg, feeling for swelling, heat or pain responses. Check each paw — between the toes, the pads and the nails. A dog that pulls a leg away sharply when you handle it is indicating pain in that area. Watch your dog walk away from you — a subtle head bob, asymmetric weight-bearing or reluctance to extend a limb fully are early signs of lameness.
Weight
Weigh your dog once a month on the same scales at the same time of day. Record it. Gradual weight loss that doesn't show visually over a few weeks is one of the most commonly missed early signs of serious illness — including cancer, kidney disease and gastrointestinal problems. A consistent record makes it visible.
😣 How to Recognise Pain in Dogs
Pain is perhaps the most consistently underdetected symptom in dogs, because dogs rarely vocalise it — even severe chronic pain. A dog that cries, yelps or whimpers is communicating pain clearly. The vast majority of dogs in pain do not do this. Instead, look for:
- Postural changes — hunched back, lowered head, reluctance to put weight through a limb, tucked abdomen
- Facial expression — a tense, worried expression; ears pinned back; eyes appearing squinted or half-closed
- Panting without cause — panting at rest, in a cool room, with no exercise — is a reliable pain indicator in dogs
- Restlessness — unable to settle, repeatedly getting up and lying down, pacing, especially at night
- Licking or biting a specific area — dogs will lick or chew a painful area even if it is internal, corresponding to the nearest accessible point on the body
- Reluctance to be touched — flinching, growling or moving away when handled in a specific area, particularly unusual in a normally touch-tolerant dog
- Changed facial tension — veterinary researchers have developed the Dog Grimace Scale, identifying that pain causes orbital tightening, ear position changes and muzzle tension visible to trained observers
- Reduced interaction — not seeking attention as usual, withdrawing from family contact, hiding
⚠️ The "still eating" misconception: Many owners assume that a dog still eating cannot be in serious pain. This is not reliable. Dogs with severe osteoarthritis, dental abscesses, tumours and even early organ failure frequently continue to eat — sometimes enthusiastically — right up until the condition becomes severe. Appetite alone is not a reliable pain indicator.
🚨 Bloat (GDV) — The Emergency Every Owner Must Know
Gastric Dilatation-Volvulus (GDV) — commonly called bloat — is one of the most rapidly fatal conditions in dogs and one of the most important things any dog owner can learn to recognise. It can progress from the first subtle signs to death within a few hours. Knowing what to look for and acting immediately is the difference between survival and loss.
What happens
The stomach fills with gas, food or fluid and then twists on itself, sealing both the entrance and exit. Blood supply to the stomach and surrounding organs is cut off. Pressure builds rapidly, compressing major blood vessels and sending the dog into shock. Without emergency surgery, GDV is fatal — and even with surgery it kills approximately 30% of affected dogs. Speed of treatment is the single biggest factor in survival.
Which dogs are most at risk
Large and giant breeds with deep, narrow chests are most commonly affected — Great Danes (around 50% will bloat in their lifetime), Irish Wolfhounds, German Shepherds, Standard Poodles, Weimaraners, Dobermanns, Setters, Bloodhounds and Labrador Retrievers. Males are twice as likely to bloat as females. Dogs with a first-degree relative that has bloated are at significantly higher risk. However, any dog of any breed or size can develop GDV — smaller breeds are not immune.
Warning signs — early and late
Early signs can be deceptively mild and are easily mistaken for minor digestive upset:
- Restlessness, pacing, inability to settle after eating
- Looking at or repeatedly sniffing the abdomen
- Excessive drooling
- Mild discomfort or anxiety
- Retching or attempting to vomit without producing anything — this is the single most important early warning sign and should be treated as an emergency in any large-breed dog
As GDV progresses:
- Abdomen visibly swollen and hard — particularly on the left side behind the ribcage
- Rapid, laboured breathing
- Pale or grey gums
- Weakness and collapse
🚨 If you suspect GDV — go immediately, do not wait
- Do not wait to see if symptoms improve — GDV does not resolve on its own and there is no home treatment
- Call the emergency vet as you are leaving — tell them you are coming with a suspected GDV case so they can prepare
- Keep your dog as calm and still as possible during transport
- Do not offer food or water
- In at-risk breeds, unproductive retching alone is sufficient reason to go immediately — do not wait for a swollen abdomen
Reducing GDV risk
For at-risk breeds, discuss prophylactic gastropexy with your vet — a surgical procedure that permanently anchors the stomach to the abdominal wall, preventing it from twisting. This can be performed at the same time as spaying or neutering with minimal additional risk and eliminates the GDV risk almost entirely. Other practical steps include feeding two smaller meals daily rather than one large one, using a slow-feeder bowl, and avoiding vigorous exercise for at least an hour after eating.
📋 Building Good Habits — The Monthly Health Check
Beyond the weekly body check, these monthly and annual habits create a safety net that catches illness early rather than late:
- Monthly weight check — on the same scales, same time of day, recorded. Even a 5% body weight change in a month warrants a vet discussion
- Monthly resting respiratory rate — count your dog's breaths per minute while they are sleeping. A normal sleeping respiratory rate is under 30 breaths per minute. Record it. For dogs with known heart disease, vets often recommend tracking this daily as an early indicator of fluid build-up in the lungs
- Annual vet check — even for dogs that appear completely healthy. Many conditions — early kidney disease, heart murmurs, early dental disease, lymph node enlargement, blood pressure changes — are detectable on examination or blood work before symptoms appear
- Biannual checks for senior dogs — dogs aged 7 and above should have a vet check every six months. The rate of health change accelerates in older dogs and six months is a long time
- Know your emergency vet — look up your nearest 24-hour emergency veterinary practice before you need it. Searching for an emergency vet at 2am while your dog is in distress costs precious minutes
🐾 Trust your instincts: Experienced vets consistently say the same thing — "my dog isn't right" from an owner who knows their dog well is a clinically meaningful statement. You do not need to be able to name or describe a specific symptom. If something feels wrong, call your vet. That instinct is built from thousands of hours of observation of your individual animal, and it is frequently correct.