Yes, dogs can shiver when they have a fever, and for the same basic reason you shiver when you’re cold. During a fever, the brain resets the body’s target temperature to a higher point. Until the body catches up to that new target, the dog feels cold, and shivering is one of the fastest ways the body generates heat. It’s not the most common sign of fever in dogs, but it happens, and it’s worth knowing what else to look for.
Why Fever Causes Shivering
A dog’s normal body temperature runs between 101°F and 102.5°F, already warmer than a human’s. A fever starts at 103°F. When an infection or inflammation triggers fever, substances called pyrogens signal the brain’s temperature control center (in an area called the preoptic hypothalamus) to raise the set point. The brain essentially tells the body: “You should be warmer than you currently are.”
At that point, the body responds as if it’s too cold. Blood vessels near the skin constrict to prevent heat loss, and skeletal muscles start contracting rapidly, which is what shivering is. This involuntary muscle activity generates heat quickly, helping the body climb toward its new, higher target temperature. Once the body reaches the new set point, the shivering usually stops, even though the dog still has a fever.
Other Signs of Fever in Dogs
Shivering alone doesn’t confirm a fever. Most dogs with a fever show a cluster of symptoms: lethargy, reluctance to move, loss of appetite, faster breathing, increased heart rate, and dehydration. Some dogs also show stiffness. If your dog is shivering but otherwise acting normally, eating well, and staying active, the cause is more likely cold, anxiety, excitement, or even dreaming during sleep.
The combination matters. A dog that’s shivering, won’t eat, seems sluggish, and feels warm to the touch (especially around the ears and nose) is much more likely running a fever than a dog that shivers briefly after a bath.
What Causes Fever in Dogs
In a study of 140 young dogs referred for persistent fever, non-infectious inflammatory disease accounted for about 79% of cases. Infections made up 17%, including abscesses, pneumonia, urinary tract infections, and bacterial infections of the chest or abdomen. Neoplasia (cancer) and congenital conditions were rare, accounting for just 1% and 3% respectively.
That breakdown might be surprising. While most people assume fever means infection, the majority of canine fevers actually stem from the immune system overreacting to inflammation rather than fighting off bacteria or viruses. Vaccines can also trigger a short-lived fever within 24 to 48 hours, which is a normal immune response and typically resolves on its own.
How to Check Your Dog’s Temperature
Touching your dog’s nose or ears gives you a rough guess at best. The only reliable way to confirm a fever is with a thermometer. A digital rectal thermometer is the most accurate option for home use. Insert it about 2 cm (roughly an inch) into the rectum and hold it against the mucosal wall until it beeps, which usually takes under a minute. Use petroleum jelly for lubrication, and have someone help keep your dog calm and still.
Ear (auricular) thermometers designed for pets offer a less invasive alternative. They read infrared heat from the eardrum and give results within seconds. They’re easier to use but can be less consistent, especially if the probe isn’t positioned correctly in the ear canal. If you get a reading that seems off, a rectal thermometer is the better confirmation tool.
Shivering vs. Tremors and Seizures
Not all shaking is shivering. It helps to know the difference, because some causes of tremors are emergencies. Fever-related shivering is typically mild, rhythmic, and involves the whole body. The dog may look uncomfortable but remains aware of its surroundings and can respond to you normally.
Muscle tremors from neurological disease tend to be more violent, involuntary, and clearly distressing to the dog. Seizures involve a loss of awareness: the dog may collapse, paddle its legs, drool excessively, or lose bladder control. Severe tremors of any kind can actually raise body temperature to dangerous levels on their own, which creates a confusing picture where the shaking itself causes the fever rather than the other way around. If your dog is shaking violently, seems disoriented, or appears mentally distressed by the movement, that’s a different situation from a mild shiver.
What to Do at Home
If your dog has a mild fever (103°F to 104°F) and is still drinking water, you can monitor them closely for 24 hours. Encourage water intake to prevent dehydration. You can apply cool (not cold) water to the paw pads and ears, or use a damp towel. Avoid ice baths, as sudden extreme cold can cause blood vessels to constrict and actually trap heat inside the body. Alcohol applied to the skin, an old home remedy, is also dangerous because it can be absorbed through the skin and cause toxicity.
Do not give your dog human fever reducers like ibuprofen or acetaminophen. These are toxic to dogs even in small doses and can cause organ damage.
When a Fever Becomes Dangerous
A fever above 104°F that lasts more than a day warrants a veterinary visit. If a dog stops drinking water entirely while running a fever, that’s an emergency, as dehydration can escalate quickly. Any fever reaching 106°F or higher is immediately life-threatening and requires emergency veterinary care. At that temperature, organ damage, brain damage, and death become real risks.
A fever paired with shivering or panting that has no obvious cause, especially alongside vomiting, diarrhea, coughing, or nasal discharge, points to something that needs professional diagnosis. Fever itself is not a disease. It’s a signal that the immune system is fighting something, and identifying what that something is determines the treatment.