881 Professional Diet is developed by Dr. Anita Young, a veterinarian graduated from the University of Cambridge, and her team. Digestive Support Formula is tailor-made for pets with digestive issues and sensitive intestines. The formula includes probiotics and prebiotics which enhance digestion and immunity. Healthy Formula contains pure salmon oil, chondroitin and green lipped mussel which are good for heart, kidney and joints, as well as preventing or deferring senile diseases.