The method for changing dog food for Bichon Frize is as follows: 1. When replacing new dog food, it should be matched with the original dog food. Do not replace it all at once. Give the dog time to adapt. 2. Add the food that the dog usually feeds to the dog. Add one-third of the new dog food to the food, and then add two-thirds of the dog food after one week, and replace it all in another week. 3. After adding the new dog food, observe the Bichon Frize's defecation and loose stools. It is normal and will get better on its own in 2-3 days.