Dogs biting their own paws may be caused by skin diseases, malnutrition, depression, long nails, etc. You need to check whether there are any abnormalities in the dog's paws. If there is a skin disease on the dog's paws, it needs to be treated immediately. To avoid the dog licking the paws and then licking other places to cause infection, regular external deworming, regular trimming of the dog's nails, and enhanced nutritional supplements, especially zinc and copper.