Your dog seems more tired than usual, doesn’t want to eat, and you notice their nose is dry and warm. This is one of the most common worries among dog owners: how can you tell if your dog has a fever without rushing straight to the emergency vet? In this article we explain which symptoms to look for, how to take your dog’s temperature correctly, the most common causes, and when it’s time to see a vet.
What Is a Dog’s Normal Body Temperature?
A dog’s body temperature runs higher than a person’s. It’s normal for it to sit between 38 and 39 °C (100.4-102.2 °F), and it can rise slightly after exercise, hot weather or an anxious moment without that meaning a fever.
A dog is generally considered to have a fever when their temperature stays above 39 °C, and the situation becomes more serious from 41 °C upwards, a threshold that calls for urgent veterinary attention.
Signs Your Dog Might Have a Fever
Fever isn’t always easy to spot at a glance, but there are signs that tend to appear together and are worth watching for.
Physical signs
- A dry, warm nose, when it’s usually moist and cool
- Ears, belly or groin that feel warmer than usual to the touch
- Shivering or trembling
- Faster breathing than normal
- Dull-looking eyes, less bright than usual
Behavioural changes
- Low energy and less interest in playing or moving around
- Loss of appetite, and sometimes reduced thirst too
- Seeking out cooler spots or withdrawing to a quiet corner
If your dog is showing several of these signs at once, that’s a good reason to confirm it with a thermometer before deciding on the next step.
How to Take Your Dog’s Temperature Correctly
Touching your dog’s nose or ears can give you a first clue, but it doesn’t replace an actual reading. The most reliable way to check if your dog has a fever is with a digital thermometer designed for veterinary use, inserted carefully into the rectum for a few seconds.
- Lubricate the tip of the thermometer with a little petroleum jelly or a neutral gel
- Gently lift the tail and hold your dog calmly, without forcing
- Insert the thermometer a few centimetres, adjusting the depth to your dog’s size
- Wait for the digital reading and remove it carefully
It’s easier if someone else can help hold your dog steady while you take the reading. If you don’t feel confident doing it yourself, at Veterinari del Clínic we can take your dog’s temperature and assess their condition during the same visit.
Common Causes of Fever in Dogs
Fever isn’t an illness in itself, but a response from the body to an underlying health problem. Here are some of the most frequent causes.
Infections and parasite-transmitted diseases
Many bacterial, viral or parasitic infections cause fever as one of their first symptoms. In our area, ticks are a common route of infection, and diseases such as leishmaniasis can present with episodes of fever alongside other, more specific symptoms, such as changes to the skin or coat.
Heat stroke: fever is not the same as hyperthermia
It’s worth telling fever apart from heat stroke. Fever is a controlled response from the body to an infection or inflammation, while heat stroke is an uncontrolled rise in body temperature caused by prolonged exposure to heat, something especially common during Barcelona’s hottest months. Both raise body temperature, but their origin and the urgent treatment they require are different.
Other common causes
Fever can also appear as a reaction after vaccination, usually mild and short-lived, or from ingesting a toxic substance. In dogs with chronic or inflammatory conditions, fever episodes can recur more easily.
What to Do If You Confirm Your Dog Has a Fever
If you confirm your dog has a fever, the first step is to stay calm and offer them a quiet, cool space with water available. You can help by lightly dampening their paw pads or belly with lukewarm water, never cold, to avoid a sudden temperature change.
Don’t give any medication on your own. Many human fever medicines are toxic to dogs, and self-medicating can make things worse rather than better. The safest option is to contact your vet so they can guide you based on the specific symptoms you’re seeing.
While you decide on next steps, it helps to note when the symptoms started, whether anything has changed recently (new food, a walk through a tick-prone area, a recent vaccination), and to repeat the temperature reading every few hours to see if it’s rising, falling or staying the same. That information will help your vet a great deal in guiding the diagnosis.
Fever in Puppies and Senior Dogs
In puppies and senior dogs, fever deserves closer attention than in a healthy adult. Their immune system is more vulnerable, either because it’s still developing or because it no longer responds as effectively as before, so a fever can escalate more quickly.
If your puppy or senior dog has a fever, even if the symptoms seem mild, it’s best not to wait and see how things evolve, the way you might with a healthy adult dog, and to seek veterinary advice sooner rather than later.
When to See a Vet Urgently
Some signs shouldn’t be left to pass on their own. See a vet or contact emergency services if your dog has a persistent high fever, if they also show vomiting, diarrhoea, difficulty breathing or marked weakness, or if they’re a puppy, a senior dog, or already have an existing health condition.
In these cases, the sooner the cause is identified, the sooner it can be treated. At Veterinari del Clínic we offer an internal medicine service and a 24-hour emergency phone line for situations like these.
Frequently Asked Questions About Fever in Dogs
Can I tell if my dog has a fever just by touching their nose?
It can give you a first clue, but it isn’t fully reliable. A dry, warm nose doesn’t always mean fever, and some dogs with a fever keep a moist nose. The only way to confirm it is with a thermometer.
Is it dangerous for a dog to have a fever for a few hours?
A mild, short-lived fever usually isn’t an immediate cause for alarm, but it’s worth watching how it develops. If it lasts more than a day, rises sharply, or comes with other symptoms, it’s time to consult your vet.
Can I give my dog paracetamol or ibuprofen to bring down their fever?
No. These medications are toxic to dogs and can cause serious harm, even at low doses. Fever in dogs should always be treated under veterinary guidance.
Does fever in dogs always mean something serious?
Not necessarily. It can stem from mild causes, such as a reaction to a vaccine, but also from infections that need treatment, including those transmitted by ticks. That’s why it’s important for a vet to assess the specific cause.
How often should I take my dog’s temperature if I suspect a fever?
As a guide, checking it every 4-6 hours while the episode lasts helps you see whether the temperature is rising, holding steady or starting to drop. Note down the readings and the time of each one so you can share them with your vet if you do end up going in for a visit.
Spotting a fever in your dog early and knowing how to respond makes a real difference to their recovery. If you have any concerns about their condition or would like us to check them over, Veterinari del Clínic is located at Carrer de Casanova, 157 (Eixample, Barcelona), and you can reach us on 936 090 200
