You love playing with your Corgi puppy. You let him nibble on your fingers as you scratch his ears. You encourage him to pounce on you hands during play time. Then one day, "ouch!" He bites down on your hand and this time, it hurts! Your puppy looks at you, confused, wondering why you stopped the fun game all of the sudden. As far as they know, this is what playtime should be like.
Nibbling and mouthing are normal behaviors for all puppies, especially for a herding animal like Corgis. However, as your Corgi puppy's adult teeth begin to grow in, a nip stops being so cute. It is important to train your Corgi puppy not to bite at an early age to prevent issues as they grow. You can't expect your pup to understand overnight that he shouldn't bite. After all, biting things is the way puppies naturally understand their world and play fighting is the way they learn to become grown-up dogs. But, with consistent training, you can help your puppy distinguish between what they are and aren't allowed to bite.
Set aside time each day to train your Corgi puppy not to bite. You can use training treats to reward the behaviors you like, but do not use physical punishment to reprimand the behaviors you don't. Punishing your puppy physically will only teach him to be more aggressive. Instead, invest in a variety of toys that your puppy can bite instead, such as tug toys. If biting is very bad, you can try putting a product like Bitter Apple or Vick's VapoRub on your hands during training sessions.