The dog may bite the hand as a game or interaction, hoping to get your attention and play with you. Dogs perceive the world through their mouths, and biting their hands may be a way for them to explore their surroundings. Dogs may bite their hands due to separation anxiety, restlessness, or other feelings of stress, and this is a way to relieve anxiety.
The dog may need training to learn what can and cannot bite. To solve this problem, you can provide enough interaction and play time to meet your dog's needs. Provide enough dog toys to give your dog other options for chewing and playing. Let your dog understand that biting is unacceptable behavior. If your dog bites hands due to anxiety or other issues, it is recommended to consult a veterinarian or a professional dog behavior consultant for a better solution.