Neurologic Faints: The neurologic pet unconsciousness is largely associated with an overactive body nerve called the vagus. This nerve traverses the chest and the neck to the animal’s brain, and its primary function is to slow the heart rate. So if anything puts pressure on it, the heart rate may be dramatically slowed down and will likely trigger seizures or abnormal brain activity thereby leaving the pet unconscious.
Cardiac Faints: The cardiac pet unconsciousness is caused by ineffective pumping of blood and insufficient supply to the brain. When that happens, the brain becomes confused, and it will not give other body organs the correct instructions. This eventually results in ventricular fibrillation, ventricular tachycardia, A-V block, or sinus syndrome among other conditions that make a pet fall into unconsciousness.