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How to deal with clinginess in older dogs
Talk with your veterinarian.
If your dog begins to change their behaviour, then you should take them to the veterinarian. Do not assume that your dog's new clinginess is simply related to aging.
Instead, you should talk with your veterinarian to see if this behavioural change is a symptom of a larger medical problem. For example, your dog may be in pain and find comfort in your presence.