Maybe the feeding place is not suitable, it is too hot, bright, noisy, several dogs are competing for food together, there are strangers present or other animals are interfering, etc. Therefore, a good eating environment should be created.
The owner needs to observe whether there are any abnormalities in the dog's mental state, body temperature, shape and color of urine and feces, eye secretions, nose, etc. If there are no abnormalities, it may be caused by picky eating. It is recommended not to feed too many snacks or strong-flavored foods, and to feed regularly and quantitatively every day.