Do Dogs Get Fevers? Signs, Causes, and What to Do

Pet owners often ask do dogs get fevers the same way humans do, and the answer is yes. The signs of fever in dogs can be subtle, which makes knowing what to watch for important. Can dogs get a fever from the same range of causes that affect humans? Broadly, yes: infections, inflammation, and immune responses can all trigger elevated body temperature in dogs. Understanding whether can dogs have fevers that require veterinary attention, versus a mild transient temperature elevation that resolves on its own, helps owners respond appropriately. And knowing whether can dogs run a fever in response to vaccination or environmental heat exposure expands the picture beyond just illness.

We’ve organized this guide by normal temperature ranges, causes of fever, symptoms to watch for, and when veterinary care is needed.

Normal Dog Body Temperature and Fever Thresholds

What Is a Normal Temperature for Dogs?

The normal rectal body temperature for dogs ranges from 101 to 102.5 degrees Fahrenheit (38.3 to 39.2 degrees Celsius). A temperature above 103 degrees Fahrenheit is generally considered a fever. Temperatures above 104 degrees Fahrenheit represent a high fever requiring veterinary evaluation. Above 106 degrees Fahrenheit, dogs are at risk of organ damage. Knowing whether do dogs get fevers of concerning severity requires measuring temperature accurately with a rectal thermometer, as surface-level temperature assessments including touching the nose or ears are not reliable indicators.

The “Wet Nose” Myth

A common misconception is that a dry or warm nose indicates fever. This is not a medically reliable sign. Nose moisture varies with activity, environment, and normal physiological cycles throughout the day. A dog’s nose can be dry while its temperature is entirely normal, and it can be moist during an active fever. For accurate assessment of whether can dogs get a fever, use a rectal thermometer. Flexible digital thermometers with a lubricant make this easier and more comfortable for the dog.

Common Causes of Fever in Dogs

Infections

Bacterial, viral, and fungal infections are the most common causes when can dogs have fevers of clinical concern. Upper respiratory infections, urinary tract infections, skin infections (pyoderma), dental abscesses, tick-borne diseases (Lyme disease, Rocky Mountain spotted fever, ehrlichiosis), and leptospirosis can all produce significant fevers. The pattern of fever onset and the accompanying symptoms help the veterinarian narrow the diagnosis. A dog that went from normal to feverish with 24 hours and has no obvious external wound or illness exposure needs bloodwork to investigate systemic infection.

Inflammation and Immune Conditions

Non-infectious inflammation also raises temperature. Autoimmune conditions, pancreatitis, certain cancers, and inflammatory bowel disease can all produce fever as part of the inflammatory response. These conditions require diagnostic workup beyond a simple infection screen. Signs of fever in dogs that recur without a clear infectious cause warrant investigation for underlying inflammatory disease.

Vaccination Reactions and Environmental Heat

One common reason can dogs run a fever without an underlying illness is vaccination. A mild temperature elevation of 103 to 103.5 degrees Fahrenheit within 12 to 48 hours of vaccination is a normal immune response and typically resolves without treatment. Overheating from environmental exposure, known as hyperthermia rather than true fever, can also produce elevated body temperatures. The distinction matters because hyperthermia is treated by cooling rather than addressing an infection or inflammation. True fevers benefit from addressing the underlying cause.

Symptoms That Accompany Fever in Dogs

Behavioral and Physical Signs

Observable signs of fever in dogs beyond a thermometer reading include lethargy, shivering despite normal or warm ambient temperature, reduced appetite, nasal discharge, excessive drinking, and loss of interest in normal activities. Some dogs with fever pace or seem restless rather than lethargic. Red or irritated eyes sometimes accompany systemic illness with fever. A dog that appears ill in multiple of these ways, particularly when do dogs get fevers alongside other systemic signs, should be seen by a veterinarian rather than observed at home.

When to Call the Vet

Any measured temperature above 103.5 degrees Fahrenheit in a dog that also shows clinical illness signs warrants a veterinary call or visit. Temperatures above 104 degrees Fahrenheit require same-day care regardless of other symptoms. Any fever in a puppy under six months, or in a senior dog, should be evaluated promptly because immune reserve is lower. Do not administer human fever-reducing medications like acetaminophen or ibuprofen to dogs. These are toxic at any dose. If a veterinarian recommends medication for fever management, they will prescribe a dog-safe option.

Pro tips recap: Invest in a flexible digital rectal thermometer and learn how to use it correctly before an emergency arises. Keep a log of your dog’s baseline temperature at wellness when healthy so you have a comparison point. Vaccination reactions causing mild temperature elevation are normal and self-limiting; true illness fevers above 103.5 degrees with clinical signs require veterinary evaluation.