Healthy dogs, are lively and lovely, energetic, flexible action. Eyes are sharp, two ears often with the sound and turn, even when sleeping, but also always keep alert state, hear a little bit of the slightest movement, on the vertical ear side listening, both eyes staring at the direction of the movement, showing a very resourceful state of mind.
If the dog appears to have double eyes or half closed, unwilling to move, like lying still, both ears slow response to external stimuli or no response, indifferent, or even lethargy, these are neurological inhibition, known as mental depression or coma.
Some sick dogs are excited and restless, running around indoors and outdoors, panicking, screaming, often walking aimlessly, circling, and even biting all kinds of objects, etc. Such mental state is called mental excitement or mania.
These two mental states are abnormal mental performance.