1. Loss of appetite 

Unfortunately, fever comes along with the loss of appetite. If the treats or even the food you give it daily doesn’t seem to be appealing anymore, this might be a sign that your dog has a fever. Of course, this particular symptom might also be a sign that the food is not ok anymore.

Loss of appetite can also be a pain in your pet’s mouth (especially if it’s old and it already has issues with its teeth),  or somewhere else in their bodies.

If you observe these changes in your dog’s behavior, take it to the vet as soon as possible! It might need a temporary change of diet or some other proper treatment.