Amino acids are the vital component of a petâs diet. Dl-Methionine is a form of the crucial amino acids that are necessary for pets like cats and dogs. This is an important component for pets to carry out bodily functions efficiently. This is added to pet food for making the cat and dog received the essential nutrients. It is available in plant based proteins food. This is a potent antioxidant that repairs liver and assists in the detoxification process of the body. In addition to this, it also helps preventing skin as well as nail problems. It also reduces the acid level in urine of pets.