A dog suddenly not eating or drinking may be caused by a variety of reasons. The following are some possible reasons and suggestions:

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Physical discomfort: such as colds, digestive system problems, oral diseases, etc. Observe the dog for other abnormal symptoms, such as vomiting, diarrhea, coughing, etc. If necessary, take your dog to the veterinarian.

Eating problems: food spoilage, dislike of taste or sudden change of food. Try switching to fresh foods, or changing foods gradually.

Environmental changes: new family members, moving, etc. Try to provide your dog with a stable and familiar environment.

Stress or anxiety: may be caused by noise, strangers, etc. Give more attention and comfort.

Dental problems: Toothache may lead to a reluctance to eat. Check your dog's teeth.