How To Tell If Your Dog Has a Fever and What to Do
Fevers in dogs can be a puzzling and worrisome experience for pet owners. Your once energetic companion may suddenly seem lethargic, uncomfortable, or out of sorts, leaving you wondering what’s wrong. While a fever is often the body’s natural response to illness or infection, it can also indicate something more serious that requires attention. If you’re concerned your dog may have a fever after hours, contact Emergency Veterinary Care Centers today to speak with our team. We’re available 24/7 to provide the care your pet needs.

What Is a Fever in Dogs?
A fever occurs when your dog’s body temperature rises above the normal range, typically between 101°F and 102.5°F. This increase helps their immune system combat infections but can also indicate an underlying health issue. Fevers in dogs can result from various causes, such as infections, inflammation, toxins, or reactions to medications. Although dogs can’t tell us they’re feeling feverish, certain behavioral and physical signs may indicate a temperature imbalance.
What Are The Signs of Fever in Dogs?
Dogs exhibit several noticeable signs when they’re experiencing a fever. While some symptoms can overlap with other illnesses, the following indicators often suggest an elevated temperature:
- Lethargy: Dogs with fevers often seem tired or less interested in their usual activities.
- Loss of Appetite: A decreased interest in food or treats could indicate that your dog isn’t feeling well.
- Warm Ears and Nose: While not always accurate, excessively warm ears or a dry, warm nose can sometimes signal a fever.
- Shivering or Trembling: Fevers may cause your dog to shiver, even when they aren’t cold.
- Panting or Rapid Breathing: An elevated temperature can lead to irregular breathing patterns.
- Red or Glassy Eyes: Dogs with a fever often have eyes that appear bloodshot or glazed over.
If your dog shows one or more of these symptoms, monitoring their temperature with a pet-safe thermometer is the most reliable way to confirm a fever.
Common Causes of Fever in Dogs
Fevers in dogs can arise from various triggers, some of which may require prompt veterinary care. Here are the most common causes:
Infections
Infections, whether bacterial, viral, or fungal, are leading causes of fever in dogs. They can affect specific areas, such as the ears, urinary tract, or respiratory system, or result from wounds or abscesses.
Ingestion of Toxins
If your dog ingests toxic substances such as spoiled food, household chemicals, or plants, a fever may develop as their body attempts to process or expel the toxin.
Vaccination Reaction
Some dogs experience a mild fever after vaccinations, which typically resolves within 24 to 48 hours.
Immune-Mediated Conditions
Autoimmune diseases, where the immune system mistakenly attacks the body’s own tissues, can cause persistent fevers. While certain fevers may resolve without treatment, others signal more serious conditions that warrant veterinary attention.
How to Confirm a Fever in Dogs
The most accurate way to determine whether your dog has a fever is to use a digital rectal thermometer designed for pets. Follow these steps to check your dog’s temperature:
- Use a pet-safe thermometer, lubricant, and disinfectant for cleaning afterward.
- Keep them calm and secure. A second person can assist by holding your dog gently.
- Insert the thermometer into your dog’s rectum about an inch and wait for the reading.
- A temperature above 102.5°F confirms a fever in dogs.
If using a rectal thermometer isn’t feasible, consult your veterinarian about alternative methods for temperature measurement.
Red Flags to Watch For Alongside Fever
While some mild fevers can resolve on their own, a fever in dogs that exceeds 103°F or lasts more than 24 hours should be evaluated by your veterinarian. Extremely high fevers (above 106°F) can lead to organ damage and require immediate emergency care. Additional signs that warrant a vet visit include:
- Persistent vomiting or diarrhea
- Seizures or disorientation
- Swelling or redness at an injury site
- Difficulty breathing
Steps You Can Take to Support Your Dog
While waiting for veterinary care or monitoring a mild fever, you can take a few steps to help your dog feel more comfortable:
- Encourage hydration, as fevers can dehydrate your dog.
- Keep your dog in a comfortable, shaded area to help regulate their temperature.
- Never give over-the-counter medications like acetaminophen or ibuprofen, as these can be toxic to dogs.
Always prioritize professional advice and avoid attempting home remedies that might harm your dog.
How Veterinarians Address Fevers in Dogs
When you bring your dog to the vet for a fever, the process typically involves diagnosing the underlying cause and providing targeted treatment. Your veterinarian may:
- Conduct a physical examination and run diagnostic tests, such as blood work or X-rays.
- Prescribe antibiotics, anti-inflammatory medications, or other treatments depending on the diagnosis.
- Recommend supportive care, including intravenous fluids, if dehydration is present.
The Importance of Prompt Care
A fever in dogs often signals that their body is working hard to fight an issue, but prolonged or high fevers can strain their health. Recognizing the symptoms and seeking timely veterinary care ensures your dog receives the attention they need. If you suspect your dog has a fever or notice other unusual symptoms, contact one of our Emergency Veterinary Care Center locations. Our experienced team is ready to assess and care for your pet.
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At Emergency Veterinary Care Centers (EVCC), we know that pet emergencies are unpredictable and often stressful. That's why our team, with over 20 years of emergency and critical care experience, is ready to assist you and your pet in the toughest situations.