There are host of reasons why dogs and puppies will chew. The first reason is teething. Most puppies will start teething between 6 to 9 months of age. Other reasons are separation anxiety and sensory stimulation. Chewing should be controlled right from the beginning. Puppy proof your home to limit the puppy’s access to items that he can chew.The key to puppy proofing is to banish clutter, anything on the floor and at dog height is at risk of being chewed, so keep things out of the puppy’s reach. Give your puppy chew items. Try to give your puppy ample exercise. Confine your puppy in a crate when you can’t watch him. Spray your furniture with bitter apple. Catch the puppy in the act of chewing a no-chew item and say ‘No’ in a loud and firm voice. Praise the puppy when he stops chewing.