Dogs normally have rectal temperatures that fall between 99.5° F and 102.5° F ¹. However, temperatures measured orally are often lower. A few factors, including their coat type, can influence a dog’s temperature. Temperatures over 103° F ² are classified as fevers. Organ failure can occur when a dog has a temperature that’s higher than 106° F. Always reach out to your veterinarian if you’re concerned your dog has a fever.

What Causes High Temperatures in Dogs?

Dogs run fevers when their immune systems have kicked into high gear, often because of infections. Autoimmune diseases and some inflammatory conditions can cause dogs to have high temperatures. Dogs can also have elevated temperatures due to overheating or too much exertion. Pets can end up with dangerously elevated temperatures as a result of being left in cars with the windows up or after exercising on hot and humid days. Dogs’ temperatures can also rise temporarily when they’re anxious or excited and often vary over the course of the day.

Are There Physical Signs That Often Accompany Fevers in Dogs?

Yes. Dogs with fevers often lack energy and have little or no interest in activities they usually enjoy. Many lose interest in eating and begin panting and shivering. Since fevers are generally linked to an underlying illness, there are additional signs related to the condition causing the immune system response.

What About Low Temperatures?

Temperatures below about 99° F or 98° F ³ are considered low and can lead to hypothermia. Low body temperatures result when dogs spend too much time in cold, windy, or wet conditions. Small dogs, puppies, and senior pets are more vulnerable to developing hypothermia in cold weather. Dogs with thin coats also have trouble staying comfortable when the mercury drops. Illness and health conditions can make it difficult for dogs to manage their body temperatures.

Are There Physical Signs That Often Accompany Hypothermia in Dogs?

Cold ears, paws, and legs are the first signs that hypothermia is kicking in. Shivering and confusion are sometimes seen in moderate cases. Dogs stop shivering and become lethargic when the condition progresses.

Are There Special Thermometers for Dogs?

You can purchase a thermometer designed specifically for veterinary use, but it’s possible to take a dog’s temperature using a thermometer designed for humans as well. Digital models are easy to read and generally safer than old-fashioned glass thermometers with mercury that can break and injure pets. Oral thermometers can make taking dogs’ temperatures a bit easier, but the readings are sometimes less predictable than ones taken rectally.

What About Feeling a Dog’s Nose?

There’s a common misconception that warm, dry noses are indications of fevers in dogs. The only accurate way to determine a dog’s temperature is by using a thermometer since the weather can influence whether a dog’s nose is warm, cold, wet, or dry.

Conclusion

Dogs’ normal temperatures range between 99.5° F and 102.5° F. Human thermometers can be used on dogs, but old-fashioned glass mercury-filled models require more time to obtain accurate readings and can be hazardous if they break. Digital thermometers are quite fast and have the added benefit of being easy to read. If your dog has trouble standing still when you use an oral thermometer, you can try using a rectal thermometer to see if they prefer it.

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