How to Take Your Dog's Temperature at Home
Knowing how to take your dog's temperature is a valuable skill that can help you decide how urgently veterinary attention is needed. A simple rectal or ear thermometer can confirm whether your dog has a fever in minutes. This guide explains the correct method, the normal range and what to do with the result.
Key takeaways
- Normal dog temperature is 38.0–39.2°C — above 40°C warrants same-day vet attention; above 41°C is an emergency.
- Rectal thermometers are the most accurate; digital ear thermometers are a practical, less invasive alternative for home monitoring.
- An absence of fever does not rule out illness — contact your vet if your dog seems unwell regardless of temperature.
Normal Dog Temperature Range
A healthy dog's body temperature ranges from 38.0°C to 39.2°C (100.4°F to 102.6°F). This is notably higher than the normal human temperature (36–37.5°C), which is why a dog that feels warm to the touch is not necessarily running a fever — their baseline is higher than ours. Anything consistently above 39.2°C is considered a fever (pyrexia); a temperature above 40°C warrants prompt veterinary attention; and a temperature above 41°C is a medical emergency as it can cause organ damage.
Hypothermia (below 37.5°C) is equally serious — seen in newborn puppies, animals in shock, or dogs exposed to extreme cold. Both extremes require veterinary assessment. It is worth knowing that temperature varies slightly with time of day (higher in the afternoon), recent exercise and emotional state — a dog that has been running or is stressed may have a slightly elevated temperature that normalises when at rest.
How to Take a Rectal Temperature
Rectal temperature is the gold standard for accuracy. You will need a digital thermometer (a simple flexible-tip digital thermometer from a pharmacy works well), petroleum jelly (Vaseline) or a water-based lubricant, and ideally a second person to hold the dog calmly.
Step 1: Lubricate the thermometer tip with a small amount of Vaseline. Step 2: Have a helper hold the dog standing or in a natural position — avoid restraining the dog so tightly it becomes distressed. Step 3: Gently lift the tail and insert the lubricated thermometer approximately 2–3cm into the rectum — stop immediately if you feel significant resistance. Step 4: Hold in place until the thermometer beeps (typically 20–60 seconds for a digital thermometer). Step 5: Remove, read the temperature, clean the thermometer with alcohol and reward your dog with praise and a treat. Keep this thermometer exclusively for the dog, clearly labelled.
Ear Thermometers for Dogs
Digital ear (tympanic) thermometers designed for pets are a less invasive alternative and are widely available from pet shops and online (typically £15–£35). They measure the infrared heat from the tympanic membrane (eardrum) and provide a reading in one to two seconds. While less accurate than rectal thermometers, they are significantly more convenient and comfortable for both dog and owner.
For an accurate reading, the thermometer probe must be positioned correctly in the ear canal — follow the manufacturer's instructions carefully. Readings from ear thermometers tend to run 0.5–1°C lower than rectal temperatures, which should be factored into your assessment. Some ear thermometers have a conversion mode. For most home monitoring purposes — checking whether a potentially unwell dog has a fever — the ear thermometer is practical and sufficiently accurate.
What to Do with the Result
If the temperature is within the normal range (38.0–39.2°C) and your dog seems unwell for other reasons, the absence of fever doesn't rule out illness — some serious conditions (severe haemorrhage, Addison's disease crisis) can cause subnormal temperatures. Take note of all other signs and contact your vet if you remain concerned.
If temperature is between 39.2°C and 40.0°C: call your vet's practice for telephone advice; they will assess urgency based on other signs. If temperature is above 40.0°C: contact your vet for an appointment today or out-of-hours if it is outside normal hours. If temperature is above 41.0°C or the dog is collapsed, convulsing, barely responsive or struggling to breathe: this is an emergency — contact an out-of-hours vet immediately and travel now. A digital thermometer costs around £5–£15 from a pharmacy and is a worthwhile addition to any home pet first aid kit.
Find a Vet Near You
If your dog has a confirmed fever or you're concerned about their health, prompt vet assessment is important. Use CompareMyVet at app.comparemyvet.uk to find local practices and their contact details and published prices for out-of-hours and emergency consultations.
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Common questions
Yes — a standard flexible-tip digital thermometer used rectally is perfectly suitable for dogs. It does not need to be a special veterinary product. Keep it dedicated to the dog (label it clearly) and use an appropriate lubricant. Human ear thermometers are generally not accurate enough for dogs due to the different angle and shape of the canine ear canal — use a pet-specific ear thermometer instead.
Common causes of fever in dogs include infections (bacterial, viral, fungal), abscesses, inflammatory conditions, immune-mediated diseases, some cancers and certain medications. Heatstroke (hyperthermia) can cause critically elevated body temperature without true fever — in this case the cause is environmental overheating rather than physiological pyrexia, though the treatment is similarly urgent.
Mild fever does not require home cooling — it is a normal immune response. However, if the dog has heatstroke (very high temperature with heat exposure, panting, collapse), cooling is essential: move to shade or indoors, apply cool (not cold) water to the body particularly the paws and groin, and get to a vet immediately. Never use ice or very cold water, which can cause peripheral vasoconstriction and worsen outcome.
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