2. Lethargy, extreme fatigue.
A lethargic dog will often appear dejected, slow, and indifferent. It may take her a few moments to respond to sights, sounds, and other stimuli in her environment.
Lethargy is a sign of something going wrong. It can be a number of things, but the most serious are life-threatening. If your pet has been lethargic or exhausted for more than 24 hours, it’s time to make an appointment with your veterinarian.