7 Signs That Your Dog Has a Fever (and What to Do While You Wait for the Vet)

2. He seems to be lacking any enthusiasm or energy.

Fever attacks the body and weakens it. Dogs tend to be active, walking around the house, trying to get another friendly pet or anyone to play with them. If they look exhausted and have little desire to communicate or interact, it’s essential to take this slumpy attitude into account as a febrile symptom.