I doubt if anyone can answer a vague question like that.
However, I can tell you that sudden changes in behavior and/or appetite are often symptoms that something may be wrong with the dog.
So, depending on the severity of the symptoms and when the dog last had a thorough checkup, if it was my dog, I might be inclined to take it to the vet and provide a description of the behavior that is concerning.
Many factors to consider, such as the dog’s age, medical history, any recent changes in the household…….
