It seems to me that the dog is thin. Need to feed more?
To begin with, figure out if it’s true. People have their own ideas about how a beautiful dog should look. And far from always, these ideas correspond to the physiology of a healthy animal. A dog in good shape shows a waist. The ribs do not stick out, but they are easily felt by hand when stroking. https://herepup.com/best-dog-food-for-sensitive-stomachs/