Sodium erythorbate is the sodium salt derived from erythorbic acid. Its purpose is very similar to that of ascorbic acid, the source of vitamin C. While sodium erythorbate does not actually contain vitamin C, it is an antioxidant and is used in processed meat to help it cure faster and retain freshness and coloring. This includes some varieties of dog food.
Sodium Erythorbate and Too Much Salt
Sodium erythorbate is a form of salt and is not dangerous for dogs to eat except for those with heart, kidney or liver disease. Dogs with these conditions can get sodium ion poisoning, which causes vomiting, depression, diarrhea, elevated body temperature, tremor and seizures or even death. It is not dangerous for a healthy dog to eat food containing sodium erythorbate, as healthy dogs are capable of consuming up to 4 grams of salt for every 2 pounds of body weight daily. Anything beyond that becomes excessive even for dogs who aren't sick.