welcome to the joys of living with a puppy..dogs explore with their mouths...it's how they learn...much like a human baby...also when they are bored, scared, anxious etc.

most puppies (& some dogs) grow out of this...some don't...

suggestions..

=use a crate when you are away...crate training is not a bad thing if used properly. get one of appropriate size, stock it with some good toys & leave the door open all the time so he can get used to going inside. you can even feed him in it so he learns it is his safe spot...

=pick up all your stuff (sound like your mother but it's true)...can't chew what isn't there

=exercise...a tired dog won't get into as much trouble...& more than just walks. that concentrate on peeing & pooping & proper leash walking...real good long fun walks or a good hike or a dog park

=you can buy stuff called bitter apple to spray, coat wires substances etc or you can even use tabasco to deter your puppy...some folks run wires thru a pipe if the distance is short & they can not trust their dogs

=feed him good quality food. feeding crappy food will make him hyper (think sugary cereal without the benefit of milk for nutrition)...all that energy & no place to burn it off

it took how many years before you could be trusted alone in the house? well a puppy is the same way..never forget it is a baby...not doing any damage out of spite or anything but because it is alone, bored, scared & has the attention span of a gnat at times.

you can also ask your breeder or shelter where you got him for advice as well.

good luck. puppyhood is a hard stage..fun but hard...stick with it...your parents did with you...i tell people it's like pay back for all the evil things we did to them as kids...

be patient. step away if need be. & honestly if you can not handle the dog because he is too much turn him in to a responsible rescue...or a shelter...they will make sure he ends up in a safe spot for the rest of his life....something that a person off of a list can not guarrentee .

stumpy