📌 HOME FOOD Blog: What to Do If Your Dog Has a Fever?

What to Do If Your Dog Has a Fever?

When a dog’s temperature rises, most owners immediately feel anxious — and that’s completely natural. Fever in a pet is often the first sign that something is wrong in the body: from a mild reaction to stress or vaccination to a serious inflammatory process or infection.

A dog’s temperature is not a trivial matter — it’s an important indicator of health. Understanding what is considered normal, how to measure it correctly, and when to see a vet will help you respond in time and protect your pet from complications.

In this article, we’ll cover:

  • what temperature is considered normal for dogs,
  • how to measure it correctly,
  • what causes a fever,
  • and what steps the owner should take.

 

What Temperature Is Considered Normal for Dogs?

Before panicking about a rise or drop in temperature, it’s important to understand that the normal range is not the same for all dogs.
It is influenced by: age, breed size, physiological state (e.g., pregnancy), activity level, and even time of day.

Small variations are natural, but a persistent deviation from the norm may indicate health problems and require a veterinary consultation.

Dog Category Normal Body Temperature
(°C)		 Comment
Puppies up to 2 months 36.5 – 38.5 °C Lower due to immature thermoregulation mechanisms. Easily get chilled in the first weeks of life.
Puppies 2–6 months 38.0 – 39.0 °C May be slightly higher than in adults — normal for an active growing body.
Young dogs (6–12 months) 38.0 – 39.0 °C Temperature stabilizes, but in large breeds it may be closer to the lower limit.
Adult small-breed dogs 38.5 – 39.2 °C Faster metabolism → slightly higher temperature than in large breeds.
Adult large-breed dogs 37.8 – 38.8 °C Slower metabolism → slightly lower temperature.
Pregnant females (mid-to-late pregnancy) 38.0 – 39.0 °C Minor fluctuations possible. Should not exceed 39.4 °C.
Before whelping (12–24 hours prior) 36.5 – 37.5 °C Temporary drop — physiological sign that labor is starting.
Senior dogs 37.5 – 38.5 °C May be slightly lower due to slower metabolism.

Important:

  • Dogs’ temperature is measured rectally with a special thermometer.
  • Readings below 37 °C or above 39.5 °C are not normal — consult a vet.
  • Temperature above 40 °C or below 36 °C can be life-threatening and requires emergency care.

 

Scientific Data on Normal Dog Temperature

  • One of the largest studies — “Calculation of a Reference Interval for Rectal Temperature in Adult Dogs…” analyzed 24,013 records from 9,782 adult dogs and established an average rectal temperature of 38.6 °C with a range of 37.7–39.5 °C.
  • The study “Effect of age, sex, and body size…” found that in puppies (4–8 weeks) the average temperature is ~37.9 °C, while in dogs >52 weeks it is ~38.8 °C.
  • The Merck Veterinary Manual states a normal rectal range of 37.5–39.2 °C. The study “Daily rhythmicity of body temperature in the dog” shows a daily rhythm with fluctuations of about 0.5 °C.
  • The study “Comparison of rectal, tympanic membrane and axillary temperature…” emphasizes that the measurement method affects the result and its deviation from the “gold standard” — rectal measurement.

 

What This Means for the Owner

  • Data show that the overall “normal” adult dog temperature range is approximately 37.7–39.5 °C, confirmed by several studies.
  • Very young puppies may have slightly lower temperatures than adults — consistent with age-group data.
  • The measurement method matters: switching methods (e.g., axillary instead of rectal) can give lower or less accurate results, so rectal measurement at home is recommended for reliability.
  • Daily fluctuations should be taken into account: temperature can vary slightly throughout the day, so don’t panic over a minor deviation — but consistently high or low readings require a vet visit.

 

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Main symptoms that accompany fever in dogs

 

Fever is not a disease on its own — it is the body’s response to an internal process: infection, inflammation, pain, or other pathology. Symptoms may appear gradually or suddenly, sometimes barely noticeable at first.

Below are the most common symptoms that may indicate fever and the conditions that can cause them.

Symptom / Behavioral Sign Possible Causes & Diseases What the Owner Should Do
Lethargy, apathy, reluctance to play or move General infections (viral, bacterial, parasitic), inflammation, pain Take the temperature, contact a vet for examination.
Hot body, hot nose and ears Fever of any origin Confirm with a thermometer; do not rely only on touch.
Rapid breathing, shortness of breath Temperature >39.5 °C, dehydration, heatstroke Provide rest and water, do not cool abruptly; go to the vet immediately if >40 °C.
Shivering, chills Onset of fever, infections, pain Keep warm, measure temperature, do not give medications on your own.
Refusal to eat, vomiting or diarrhea Viral infections (parvovirus, distemper, leptospirosis), intoxications, GI inflammation Immediate veterinary consultation — these are serious symptoms.
Dry or cracked nose, dry mucous membranes Dehydration, fever Offer water, measure temperature, go to the clinic.
Enlarged lymph nodes, pain on touch Infectious diseases, autoimmune conditions Veterinary exam and laboratory diagnostics.
Seizures, unsteady gait, heavy breathing Very high temperature (>41 °C), heatstroke, neurological complications Emergency care — rush to the clinic!
  • Temperature 39.5–40 °C — see a vet the same day.
  • Temperature >40 °C or <36 °C — life-threatening emergency.
  • Never give human antipyretics — they are toxic; there are specially formulated NSAIDs for animals.
  • Only a veterinarian can determine the exact cause after examination, tests, and, if necessary, imaging.

 

How to Take a Dog’s Temperature

Taking a temperature is not just a formality — it’s a crucial diagnostic step that can detect a problem early. Even “routine” measurement requires care, proper equipment, and technique. Below is a detailed guide and recommendations from international veterinary associations.

Step-by-step method (rectal measurement — the “gold standard”)

  1. Prepare everything: digital thermometer, lubricant (gel or petroleum jelly), antiseptic for cleaning, towel.
  2. Have help: usually two people — one calmly holds the dog (lying on its side or standing, depending on size), the other performs the measurement.
  3. Lubricate the thermometer tip — this reduces discomfort.
  4. Gently lift the tail and insert the thermometer rectally: ~2–3 cm for small dogs, up to 4–7 cm for large dogs.
  5. Hold the thermometer steady until the beep (digital) or time is up (analog).
  6. Remove the thermometer, record the reading immediately. Then thoroughly clean and disinfect the tip.
  7. If the dog is upset, praise and reward with a treat — this reduces stress in the future. If the dog is restless, aggressive, or tucks its tail — do not force it. Contact a vet or use a less invasive method instead.

 

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Which Thermometers Are Recommended

  • Digital rectal thermometers — the most accurate. Many vets note that rectal measurement gives the most reliable result.
  • Ear (aural) thermometers for pets — less accurate but usable if rectal is impossible. Must be designed for animals and account for canine ear anatomy.
  • Surface methods (axillary, skin, etc.) — only for rough estimation, not diagnostically accurate. Studies show lower precision.
  • Mercury glass thermometers — banned for home and professional use in small pets due to risk of injury or mercury exposure.

 

First Aid for Fever in Dogs

Fever is a symptom, not a disease, signaling an underlying issue: infection, inflammation, intoxication, overheating, or other pathology. The owner’s job is to support the dog and get it to a veterinary clinic as quickly as possible — not to “bring the fever down” yourself.

Provide access to clean water

  • Constant fresh water is the first priority. Fever causes rapid fluid loss through panting, which can lead to dehydration.
  • Offer small amounts frequently. Specially formulated water for dogs with optimal pH and electrolytes can help maintain hydration.
  • If the dog won’t drink — do not force it! IV fluids will be needed at the clinic.

 

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Create Comfortable Conditions

  • Provide a cool, well-ventilated room without drafts.
  • Avoid overheating — do not cover with blankets or place in direct sun.
  • At very high temperature (>40 °C), apply a cool (not ice-cold) towel to paws, belly, or armpits — sudden cooling can cause vascular spasm.

 

Get to a Veterinary Clinic as Soon as Possible

Temperature is only a symptom; treatment is impossible without identifying the cause. At the clinic, the vet will perform:

  • Clinical examination — assessment of general condition, breathing, mucous membranes, pulse, temperature.
  • Laboratory tests — CBC, biochemistry, urine, possibly tests for viral infections (parvo, distemper, leptospirosis, etc.).
  • Imaging as indicated: ultrasound, X-ray, ECG, temperature monitoring.
  • IV fluid therapy for dehydration or heatstroke.
  • Targeted treatment (antibiotics, antivirals, anti-inflammatories, symptomatic drugs).

Veterinarian’s advice: Do not wait for the fever to “go away on its own.” Pathological processes in animals often progress quickly, especially in puppies and seniors.

 

When to Seek Help Immediately:

  • temperature above 40 °C,
  • temperature below 36.5 °C,
  • shortness of breath, seizures, refusal of water/food,
    vomiting, diarrhea, chills, or severe lethargy.

The nose is NOT a reliable fever indicator

Many owners still believe the common myth:

“If a dog’s nose is dry or warm — the dog is sick.”

 

In reality, this has no diagnostic value.
A dog’s nose naturally changes throughout the day due to sleep, activity, humidity, or room temperature. A healthy dog can have a wet, warm, or slightly dry nose — none of these indicate fever.

 

Why you cannot rely on the nose:

  • its temperature does not reflect body temperature;
  • the nasal mucosa reacts quickly to the environment;
  • even with high body temperature the nose can stay moist, and vice versa.

The only accurate way to know a dog’s temperature is to measure it with a thermometer.
Relying solely on touch can delay treatment or lead to wrong conclusions.

As every practicing veterinarian says: “A wet nose is no guarantee of health, and a warm one is not a death sentence.”