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A dog with a torn paw pad will still wag at the front door. A dog with a fever will still finish dinner. That’s what makes illness in dogs so easy to miss: they are wired to look fine, and they are very good at it.
Vets hear the same thing most weeks. By the time a dog is on the examination table, the owner usually says some version of “he was normal yesterday,” when the small changes had in fact been stacking up for ten days. Knowing the signs your dog needs to see a veterinarian isn’t about panicking at every sneeze. It’s about recognising the handful of changes that genuinely deserve a professional look, and separating them from the ones that can safely wait until morning.
Dogs Are Built to Hide What’s Wrong
In a wild pack, an animal that limps or vomits becomes a target. That instinct didn’t vanish when dogs moved onto our sofas. A dog in pain will often eat, greet you at the door and trot around the block, then quietly go downhill in the small hours when nobody is watching.
Some of the earliest signs show up as behaviour rather than symptoms. A dog who suddenly sleeps in the hallway instead of your bed. One who stops jumping onto the couch. One who goes off into the garden to be alone. There’s a reason dogs hide when they’re sick, and once you understand that instinct, it becomes much harder to be fooled by a wagging tail.
Appetite and Thirst Changes Worth Acting On
Skipping meals
One missed meal in a bright, bouncy dog is rarely a crisis. A full 24 hours without food is different, and puppies, toy breeds and diabetic dogs shouldn’t go more than 12. Small dogs can slide into low blood sugar surprisingly fast. Watch closely for the dog who wants to eat but drops food from the side of his mouth, chews only on one side, or approaches the bowl and walks away. That pattern points to dental pain, nausea or something stuck, not fussiness.
Drinking far more than usual
A rough guide is 50 to 60ml of water per kilogram of body weight per day. If you’re refilling the bowl three times when you used to do it once, or the dog is waking you at 3am to go outside, that’s a pattern vets take seriously. Increased thirst and urination are among the earliest signs of diabetes, kidney disease, Cushing’s and womb infections in unspayed females. Measure the bowl for a day and you’ll arrive at the appointment with real numbers instead of a vague feeling.
Vomiting and Diarrhoea: When to Stop Waiting
A single vomit, followed by a dog who asks for a walk, is usually a wait-and-see situation. The picture changes with repetition, with pain, or with a dog who goes flat. Puppies and seniors dehydrate quickly, and a small dog can look dangerously dull within a day of watery stools.
Ring the clinic if you see any of the following:
- Vomiting more than twice in 12 hours, or any vomiting combined with lethargy
- Diarrhoea lasting past 48 hours in an adult, or 12 hours in a puppy
- Blood in vomit or stool, or black, tarry stools
- A tense, swollen or painful belly
- Vomiting after chewing a toy, bone, corn cob or sock
If your dog has a long history of loose stools and you’re constantly changing brands, it’s worth fixing the diet properly rather than guessing. Good options for a dog with a sensitive stomach exist, and settling on one consistent formula often does more than a cabinet full of supplements.
Energy, Behaviour and the Dog Who Isn’t Quite Himself
Lethargy is the vaguest and most useful sign on this list. A dog who normally patrols the front window and now stays on the bed for two days is telling you something. So is the dog who can’t settle, paces at night, or snaps when you touch his flank. Pain in dogs often surfaces as irritability rather than yelping, and a dog who growls when lifted is frequently a dog with a sore back or belly.
Call the same day for head pressing against walls, walking in circles, a sudden head tilt, wobbliness, or a first seizure. Those are neurological signs, and they don’t improve with a night’s sleep.
Breathing, Coughing and Gum Colour
At rest, a healthy dog takes roughly 10 to 30 breaths a minute. Count for 15 seconds while he’s asleep and multiply by four. More than 30 at rest, or breathing that pulls the belly muscles in with flared nostrils, means the clinic today. A cough that worsens at night, or one that ends in a retch, can point to heart disease or kennel cough rather than a tickle.
Gums are the fastest window into circulation. They should be bubblegum pink and refill in under two seconds after you press them with a thumb. Pale white, grey or blue gums are an emergency, full stop.
Ears, Eyes and Skin
Head shaking, scratching at one ear, a yeasty smell or dark discharge usually means infection, not dirt. Floppy-eared dogs and allergy-prone dogs get these repeatedly, and endless courses of drops without tackling the underlying cause is how the cycle keeps going. If your dog is on his third ear infection this year, read up on recurrent ear infections and the yeast connection before you buy another bottle of cleaner.
With eyes, squinting is never a wait-and-see sign. A scratched cornea can go from minor to surgical in 24 hours. Green or yellow discharge, a red white of the eye, or a sudden cloudy haze all need a same-day look. On the skin, watch for lumps that grow quickly, hot spots that spread, and hair loss in defined patches.
Stiffness, Limping and “Just Getting Old”
Reluctance on stairs, a stiff 20 minutes after getting up, lagging behind on walks. Owners frequently write this off as age, and dogs quietly adapt by doing less. Arthritis is very manageable when it’s treated early, so a diagnosis is worth having. A dog who suddenly won’t bear weight on a leg, cries when picked up, or is dragging his nails needs to be seen that day.
Toilet Habits That Signal Trouble
Straining to urinate with little or nothing coming out is a genuine emergency in male dogs. A blocked urethra can turn fatal within 24 to 48 hours, and the first sign is often just repeated trips outside with no result. Blood in the urine, dribbling while lying down, or new accidents in a house-trained dog all deserve a check, particularly in older females where infection and incontinence can look almost identical from the outside.
Signs That Mean Go Now, Not Tomorrow
- A hard, swollen belly with unproductive retching (possible bloat or GDV)
- Collapse, or a dog who cannot stand
- Pale white or blue gums
- Laboured breathing at rest
- A seizure lasting over two minutes, or two seizures back to back
- Straining to urinate with nothing produced
- Suspected poisoning from chocolate, raisins, xylitol or cleaners
- Heatstroke: heavy panting, wobbling, body temperature above 40°C
The list of everyday items that can hurt a dog is longer than most people assume. Grapes, macadamia nuts and sugar-free gum all catch owners out. Before you decide whether to wait or rush out, ring your vet or a poison line, and it helps to know what’s actually safer for your dog around the house so you can answer questions about what he swallowed and roughly how much.
Keep a Symptom Log That Does the Work for You
Vets don’t need a diagnosis from you, they need a timeline. Note the day it started, what changed that day, and the numbers that matter: how much water, how many meals refused, how many episodes of vomiting, how many hours between them. Weigh your dog weekly if you can manage it, since a 5% drop in body weight on a 30kg dog is 1.5kg, and that’s a lot of muscle to lose quietly.
Film the cough or the limp on your phone. Twenty seconds of video shows a vet more than five minutes of description, especially for a symptom that conveniently vanishes in the consulting room.
If you’re travelling while your dog is mid-treatment, write the medication schedule down and hand it over properly. Choosing someone reliable matters as much as the plan itself, and this guide on how to find a dog sitter you’ll trust covers what to ask before you leave a recovering dog behind.
Then make the call. Most of the time it will be nothing serious, and you’ll have spent an hour and a bit of money for peace of mind. Every so often it’s the appointment that changes the outcome, and you’ll be very glad you didn’t wait for a more convenient reason to go.
