Well first off, I'm not sure where you live but I would not leave him outside, that's a good way for them to get too hot and die, even if it's in the mid 70's outside. Plus not to mention someone steeling him. That being said, with the biting, he is bored and they love to chew. Just keep plenty of chew toys available, no rawhides, pig ears, or bully sticks. When he is chewing on you just tell him "NO" and give him a chew toy. Same goes for when he chews on the furniture, but you have to catch him in the act to correct it. Just be patient, as this too will pass.