Dogs are like infants they cant tell their problem. You touch the dogs nose and the back of ears and notice the temperature, in fever it would be warmer, but a thermometer is preferred. The normal body temperature is 102 F. Itching and vomiting are also the symptoms. For more info click here.

 You can feel his forehead and you will know or you can get a thermometer and put some jell on it and put it up the rectum. temperature should be 97-98