I completely disagree with the people who say he's a keeper because he bites. A dog that bites unpredictably is unpredictable.
You've started with the right attitude: your dog can and will bite. Many owners tend not to acknowlege this fact, even when confronted with clear evidence.
I agree with the comments about insurance liabilty. Learn what the laws in your area are. Your dog might be on strike 2 of 3, especially since he bit a mail carrier.
Finally, if you want to keep this dog, get him to a professional trainer, ASAP. He must not bite again, and it's your responsibility to find out why he's biting and to take the necessary measures to prevent it. Prevention may mean anything from a muzzle and training, to putting him down.
You've started with the right attitude: your dog can and will bite. Many owners tend not to acknowlege this fact, even when confronted with clear evidence.
I agree with the comments about insurance liabilty. Learn what the laws in your area are. Your dog might be on strike 2 of 3, especially since he bit a mail carrier.
Finally, if you want to keep this dog, get him to a professional trainer, ASAP. He must not bite again, and it's your responsibility to find out why he's biting and to take the necessary measures to prevent it. Prevention may mean anything from a muzzle and training, to putting him down.