Chewing.

although you look at your dog as being fully grown and grownup he really isn't. You dog is basically running around and getting into things just like a young child would. Just bear with him. He'll will grow out of it. For now try locking him up when you go out. It's not being mean in anyway.

I never let the young dogs roam the house when I'm not home. They are crate trained, and I think that's the way to go. They remain safe, and your stuff doesn't get damaged. When you catch the dog chewing something he shouldn't, immediately correct him, and give him something that he is supposed to chew, like a nylabone or something. Please don't consider giving this dog up because of a minor behviour issue.

Your dog is a dog, not a humane child that you can explain to them what the rules are when you are not home unless you really show them what is acceptable and not - dogs have strong senses of smell and will investigate things that they can detect. Its not his fault that he opened the present - he was left unattended. I would confine the dog to a hallway or large bathroom behind a babygate or crate him when no one is home. When you are home and paying attention to him and you see him chew something, gently pull him away from it by the collar just enough so he raises his head and then replace it with an item he CAN chew like a chew toy, a rope toy, etc. Many people complain that their dogs chew but they never teach them the aporpriate things to chew are. Your dog still has adult teeth coming in so is going to chew. Even dogs that are more trustworthy benefit by not being given the run of the house all the time when you aren't home. Not just for that, but there are plenty of things people leave out that are bad for dogs - leaving the bathroom cabinet ajar, etc that a dog will investigate and its for your dog's protection and not just your "stuff" that its good to not give them total run.

Hello do not let go of the puppy. Anyways, just have a cage for him when you're gone. I am giving you a link on how to deal with the chewing puppies. http://dogs.about.com/cs/basictraining/qt/teething_puppy.htm I hope it could help. :)

A kennel is a very good idea. And it's not really a punishment for the dog if you introduce them to it right. Right now my dog is sleeping in her kennel with the door open. She just sees it as her "spot." There are also sprays that you can get from any pet supply store that you spray on things you don't want the dog to chew. It won't hurt the dog or kids, but it has an unpleasant scent for the dog. It worked great for my lab. Good Luck!