Medium quality ingredient - nutritionally adequate and unlikely to cause any problems
Threonine in dog food
Threonine is a necessary building block for many of the proteins in the dog's body. It is an essential amino acid which means that it cannot be made by the dog and so must be eaten. Threonine is present in a wide range of foods, particularly meats, and so is present in all dog foods. Nevertheless, some dog food manufacturers top up the threonine levels with a nutritional supplement.