a pup from the age 3 to 6 months is anxious to test out his teeth and exercise his jaws on just about everything he sees. sometimes too excessive chewing is a result of a vitamin deficiency. contrary to what you think, the pup would rather chew on a big bone than on your sofa. so giving him his own chewable toys to play with will lessen the chances of his going to work on things in your home. reward him when he chews on his toys and dont allow him to chew on anything else.