Do you know how to tell if your dog has a fever? Dogs and cats normally have a higher body temperature than humans. Normal for your dog is 101 degrees Fahrenheit, 102 for cats. A temperature over 103.5 is considered a fever. You will need rectal thermometer to take your pet's temp, there really isn't any other method. Have someone help by restraining your dog while taking your pet's temperature. You don't want your dog to sit or escape during this procedure. The thermometer should be fairly clean when it is removed. Blood, diarrhea or black, tarry stools indicate an abnormality and you should contact your vet. If your dog does have a fever, keep them well hydrated. You can also add some pedialyte to replace minerals that can become depleted during a fever. Some pets prefer beef or chicken broth or the water from a can of tuna. Use whatever works, as long as you get them to drink. If you are having trouble, you can try using an eyedropper or turkey baster and squirt water into the side of their mouth. Call your vet if your pet's fever lasts longer than 24 hours.