Dogs need all kinds of vitamins, just like humans. Although some vitamins can be synthesized by dogs themselves, dogs will have some diseases if they lack different vitamins.
1. Vitamin A: Deficiency of vitamin A will cause night blindness, loss of appetite, poor production and development, physical weakness and other symptoms, but excessive vitamin A will also lead to loose legs, limb bone damage and lameness, gingivitis and tooth loss. Therefore, the best amount of vitamin A in dog food should not be overdone.
2. Vitamin B1: Vitamin B1 (thiamine) can promote the metabolism of carbohydrates, so if the food contains carbohydrates, vitamin B1 needs a lot. Vitamin B1 is easy to be damaged by heat and raw fish containing thiamine enzyme, so if the feed is heated or there are raw fish, more vitamin B1 should be given. When vitamin B1 is deficient, the dog will show anorexia, vomiting, nervous disorder, unstable action, and death due to heart failure.
3. Vitamin B2 (riboflavin) plays the role of coenzyme and affects the metabolism of protein, fat and nucleic acid. It is the basic component of many oxidase systems. Bacteria in the small intestine of dogs can synthesize part of the needed vitamin B2. In the absence of vitamin B2, anorexia, weightlessness, muscle atrophy of hind legs, testicular hypoplasia, conjunctivitis and corneal opacification were found.
4. Vitamin C: Vitamin C can be synthesized by glucose, which is generally not supplemented. In the absence of vitamin C, the patient presented paroxysmal severe pain, and then recovered to normal field. For example, when the dog wakes up after sleeping, it is difficult for the foot to stretch within a few minutes. At this time, it can add vitamins appropriately.
5. The amount of vitamin D needed by dogs depends on the concentration and proportion of calcium and phosphorus in the food. If the concentration and proportion of the two are appropriate, the amount of vitamin D needed will be less. Adult dogs do not need too much vitamin D. However, rickets may be caused by vitamin D deficiency in young dogs. However, excessive vitamin D may cause calcification of soft tissue, lung, kidney and stomach, deformity of teeth and jawbone, and even death of dogs.
6. Vitamin E. The demand for vitamin E depends on the polyunsaturated fatty acids in the diet. Rancid fat can destroy vitamin E, so it can’t be fed to dogs. Insufficient intake of vitamin D will lead to bone malnutrition, testicular epithelial degeneration and pregnancy difficulties in female dogs. However, long-term over feeding may affect thyroid activity and blood coagulation.