What does it mean if a dog is suddenly very clingy?

A dog that is suddenly particularly clingy may be caused by nervousness, fear, anxiety, physical discomfort, or increasing age. First, check whether there is any abnormality in the dog's body. If necessary, take the dog to Check the pet hospital, if not, it should be an emotional problem.
Tip:
You can spend more time with your dog, comfort your dog, and let your dog relax.