Why Every Dog Owner Should Know Their Dog's Vitals
You know your dog better than anyone. You notice when they are off colour, quieter than usual, or not eating with their normal enthusiasm. But turning that gut feeling into useful information for a vet requires something more objective: an ability to measure and describe what is actually happening in your dog's body.
Learning to check your dog's vital signs at home takes no special equipment beyond a digital thermometer, a watch with a second hand, and your own eyes and hands. It takes less than five minutes once you are practiced. More importantly, it gives you accurate data to relay to your vet over the phone when deciding whether a situation needs emergency attention — potentially saving a journey in the middle of the night or, in more serious cases, life itself.
The Five Vital Signs to Know
1. Temperature
Normal body temperature in a dog ranges from 38.3°C to 39.2°C. Anything below 37.8°C (hypothermia) or above 39.5°C (fever) warrants veterinary attention. A temperature above 40°C is a medical emergency.
To measure your dog's temperature, use a digital rectal thermometer. Lubricate the tip with a small amount of petroleum jelly or water-based lubricant. Gently insert the tip approximately 2.5 centimetres into the rectum and hold it in place until the thermometer beeps. Always have a second person to hold the dog still during this process. Ear thermometers designed for dogs are less accurate than rectal measurements but can give a reasonable indication if your dog absolutely will not tolerate the rectal method.
Common causes of fever include infection, inflammation, immune-mediated conditions, and certain toxins. Hypothermia can occur after prolonged exposure to cold, in newborn puppies, or as a sign of shock.
2. Heart Rate (Pulse)
Normal resting heart rates vary significantly by size:
- Large dogs (over 25 kg): 60 to 100 beats per minute
- Medium dogs (10 to 25 kg): 80 to 120 beats per minute
- Small dogs (under 10 kg): 100 to 160 beats per minute
- Puppies: up to 180 beats per minute
To take your dog's pulse, place two fingers — not your thumb — on the femoral artery, which runs along the inside of the rear leg in the groin area. Press gently until you feel a rhythmic pulse. Count the number of beats you feel over 15 seconds and multiply by four to get beats per minute. Alternatively, place your hand over the left side of your dog's chest, just behind the front leg, to feel the heartbeat directly.
An abnormally fast heart rate (tachycardia) can indicate pain, fever, shock, or heart disease. An abnormally slow rate (bradycardia) may be normal in very fit large dogs but can also indicate certain heart conditions or medication effects. Irregular rhythms — where the beat does not feel steady — should always be investigated by a vet.
3. Respiratory Rate
A resting dog should breathe between 10 and 30 times per minute. Puppies and small dogs breathe slightly faster. Anything consistently above 40 breaths per minute at rest, or any laboured, noisy, or open-mouthed breathing (outside of normal panting after exercise), is a concern.
To count respiratory rate, watch your dog's chest or flank rise and fall while they are calm and still — ideally while they are asleep or resting. Count each rise-and-fall as one breath. Count for 30 seconds and multiply by two. Alternatively, count for a full minute for greater accuracy.
Elevated resting respiratory rate is one of the earliest detectable signs of heart failure in dogs. Many cardiologists now recommend that owners of dogs diagnosed with heart disease monitor and record the resting respiratory rate daily at home — a sustained rate above 30 breaths per minute should prompt an urgent call to the vet.
4. Capillary Refill Time (CRT)
Capillary refill time measures how quickly blood returns to the small vessels of the gum tissue after pressure is applied. It is a quick and useful indicator of circulation and perfusion. Normal CRT is less than two seconds.
To check CRT, lift your dog's upper lip and press a finger firmly against the gum for two seconds, then release. The area under your finger will blanch white momentarily. Count how many seconds it takes for the normal pink colour to return. If it takes more than two seconds, or if the gums do not regain colour quickly, this may indicate poor circulation, shock, or anaemia.
5. Gum Colour
Healthy gum colour in most dogs is a salmon pink — moist, smooth, and uniform. Gum colour is an excellent window into your dog's overall health and changes quickly when something is wrong.
Learn what your individual dog's normal gum colour looks like when they are well. Then use the following guide when something seems off:
- Pale or white gums — anaemia, internal bleeding, shock, or poor circulation. Seek veterinary attention immediately
- Blue or grey gums — oxygen deprivation (cyanosis). This is an emergency — call a vet immediately
- Bright red gums — early heat stroke, carbon monoxide exposure, or certain toxins
- Yellow gums — jaundice, indicating liver disease or destruction of red blood cells
- Muddy brown gums — sometimes seen with certain toxin ingestions
- Tacky or dry gums rather than moist — dehydration
How to Check for Dehydration
In addition to gum moisture, perform a skin tent test. Gently pinch a fold of skin on the back of your dog's neck or between the shoulder blades and release it. In a well-hydrated dog, the skin springs back immediately. If the fold stays tented or returns to normal slowly, your dog may be significantly dehydrated and should be seen by a vet.
Normal Ranges: Quick Reference
- Temperature: 38.3°C to 39.2°C
- Heart rate: 60 to 160 beats per minute (varies by size)
- Respiratory rate: 10 to 30 breaths per minute at rest
- Capillary refill time: under 2 seconds
- Gum colour: salmon" title="Can Dogs Eat Salmon? Safety Guide + The Raw Fish Warning">salmon pink and moist
When to Call a Vet Immediately
Contact your veterinary practice without delay if you observe any of the following:
- Temperature above 40°C or below 37.8°C
- Heart rate below 50 or above 180 beats per minute, or an irregular rhythm
- Resting respiratory rate consistently above 40 breaths per minute, or any open-mouthed breathing at rest
- CRT greater than two seconds
- Any abnormal gum colour — especially pale, blue, or white
- Skin tent test showing slow return
Keeping a note of your dog's normal vital signs when they are healthy makes it far easier to recognise when something is wrong. Consider recording these values in a pet health log — some owners find a simple notebook or notes app on their phone works perfectly. This record can also be invaluable information to share with your vet at routine appointments or in an emergency.