Migru
Dogs belong to the order Carnivore in animal taxonomy. The ancestors of dogs mainly hunted small animals, and occasionally used tubers to satisfy their hunger. After dogs were trained by humans, their eating habits changed and they became omnivores who mainly eat carnivores. However, vegetarianism can also protect their lives. Even so, they still maintain a habit of eating mainly carnivore. For example, a dog's teeth have a pair of extremely sharp dog teeth on the left and right sides, which reflects the characteristics of carnivores that are good at biting prey. The molars of dogs It is also sharp and strong, and can cut food. When biting bones, the pressure between the left and right teeth can reach 165 kilograms, but it is not good at chewing. Therefore, when dogs eat items, they really "gobble them up" and rarely taste them.
There are rich striated muscles on the esophageal wall of dogs, and the vomiting center is developed. When poison is ingested, it can cause violent vomiting. Eliminating the poison swallowed in the stomach is a relatively special defense mechanism. The dog's salivary glands are developed and can secrete a large amount of saliva to moisten the mouth and feed, making it easier to taste and swallow. Saliva also contains lysozyme, which has bactericidal efficiency. In the hot season, body temperature is adjusted by evaporation and dissipation of water in saliva. Therefore, in summer we can often see dogs opening their big mouths and sticking out their long tongues in order to dissipate heat instead of sweating. Dog stomachs are not pear-shaped, and the hydrochloric acid content in gastric juice is 0.4~0.6%, ranking first among livestock. Hydrochloric acid can stretch and denature proteins to facilitate digestion. Therefore, dogs have a strong ability to digest protein, which is a prerequisite for their carnivorous habits. Dogs can empty all the food in their stomachs 5 to 7 hours after eating, which is much faster than other herbivores or omnivores. The intestines of dogs are shorter, generally only 3 to 4 times the body length, while the intestines of horses and rabbits, which are also monogastric, are 12 times the body length. Dogs have thick intestinal walls and strong absorption capabilities, which are typical carnivorous characteristics. The dog's liver is relatively large, equivalent to about 3% of the body weight, and the bile secreted is good for fat absorption. The dog's defecation center is not developed and cannot defecate under advanced conditions like other livestock.
Dogs can digest and absorb protein and fat very well, but due to insufficient digestion and short intestinal tubes, they have no fermentation ability, so they have poor digestion ability for crude fiber. Therefore, when feeding vegetables to dogs, they should be chopped and cooked, and it is not advisable to feed them whole pieces or whole plants.
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