Some typical features common to carnivores are a large mouth opening, a single hinge joint that lays in the same plane as the teeth, and a large primary muscle on the side of the head for operating the jaw. The teeth are short and pointed, made for grasping and shredding. These teeth come together to give a cutting motion and act like shears. The teeth and mouth of the carnivore are developed to swallow food whole, not for chewing or crushing. Carnivores do not have digestive enzymes in their saliva.
Humans have amylase, which helps to begin to break down complex carbohydrates.
The dogs digestive tract is one third to one half the length of an omnivore. This shortness is designed for adaption for quick, muscular digestion of raw meat and bones. Carnivores have a much higher concentration of hydrochloric acid in the stomach for break down of proteins and to kill any dangerous bacteria. Their stomach acidity is less than or equal to pH 1 with food in the stomach, while humans are pH 4 to 5. This raises the question of what is the best food for carnivores, according to their digestive tract and physiology.