Althea root, also known as marshmallow root, is a plant-derived ingredient that comes from the root of the Althaea officinalis plant. In dog food, althea root is primarily used for its potential to act as a natural thickener or stabilizer. It can help improve the texture and consistency of pet food products.Althea root, also known as marshmallow root, is a plant-derived ingredient that comes from the root of the Althaea officinalis plant. In dog food, althea root is primarily used for its potential to act as a natural thickener or stabilizer. It can help improve the texture and consistency of pet food products.Read More