excessive chewing

Question
hello. I have a male(not neutered) Maltese Shtz zu mix approx. 10 months old named bosley . He is extremely affectionate and for a puppy quite gentle . He follows me everywhere I go and has from day one he actually came to me at the kennel I was helping out at, and as of right now he is laying on the floor next to me as usual. Now the problem... he is chewing EVERYTHING!! I do not know how to stop him I have tired picking up everything off the floor level and removing things from end tables and coffee table, but somehow he still finds something to chew (example half of his nose is blue from a pen he chewed earlier)I do not belive in hitting my animals other than a gentle smack on the nose or rump . He is crate trained and uses the crate on his own. I have 2 other dogs in the house a 1yr old  chi. and a 15yr old terrier mix.  Neither of them are chewing . He is not allowed people food and until recently dose not beg at the table unlike the other two dogs and when he dose beg it only lasts for a few seconds and he goes and lays down in his crate or under the livingroom couch (his favorite place)without being told to do so. HE has allot of toys to play with,gets dog treats as rewards and plenty of exercise playing with people and the other dogs and house cat as well as "freetime" in my large enclosed yard . He is very intelligent and learns tricks quickly however the chewing is getting to be very trying.! He also has another "problem" any time I go anywhere regardless of time he acts as if I have been gone for days even if it is only 1 minute. He rarely barks and dose not whine at all just stares out the window until he gets tired and goes to bed. Any advice you can give would be very helpful . THANK YOU!!

Answer
First of all, getting people food has nothing to do with this.  My dogs get people food all the time, since I often use real meat to train with.  Your problem is developmental - your puppy is just in his "second chewing stage".  The primary teeth are lost at age 4-5 months, but at adolescence the dog must chew strongly to set the secondary teeth into the jawbone.  The solution is simply to provide suitable chew toys, crate the dog when you cannot supervise him - and wait.  Small breed dogs mature faster than large breeds, so that's in your favor.  By the time he is about a year old, or just a bit more, this should subside.
Do not smack your dogs at all!!!!!!  Even a small smack is unacceptable, and it doesn't teach the dog anything except that you are unpleasant;-)  Instead, learn to train properly by going to a class that uses positive reinforcement techniques.  All your questions should have been answered in any well run basic class.  I would not consider it a problem that my dogs get excited when I come back, even if I am gone only a minute - but your dogs do need to know how you like to be greeted & if it isn't by jumping all over you, then again, the responsibility lies in your training them to do an alternative behavior, such as "sit".  If you need to find a training class, www.clickerteachers.net has a listing.  There are some free lessons at www.clickerlessons.com.  Good luck.