Give him a chew toy instead. If your dog attempts to chew on an inappropriate item while in your presence, simply interrupt the behavior and re-direct him to an appropriate chew toy. It can be helpful to have a stuffed Kong toy in a Ziplock bag in your freezer – so you can quickly produce it when needed. Many pups have certain times of day when they are more likely to chew, so you can head this behavior off at the pass if you choose this time of day to give the dog an approved chewie.
Mouthing and chewing in puppies is a completely normal, albeit annoying, thing. They begin doing this from an early age to explore their environment and learn bite inhibition through the feedback of their littermates. Mouthing is also part of normal play behavior for puppies and dogs. When you reach towards your puppy to pet him, that’s very exciting for him. He responds out of excitement by mouthing (chewing) your hand.
In this video, Preventive Vet dog, Marshall, can be seen playing with his Mighty Bone. Despite not being as durable as the Tuffy brand, it's been a huge hit with Marshall, who likes to test the limits of all of his toys. This toy has done surprisingly well at withstanding his chewing and tug of war. It's also light, large enough for him to easily catch in his mouth, and soft enough for the times he doesn't catch it and it bounces off his head. He's 10 years old and this is the first time he's actually been able to play catch like this. It turns him into a puppy every time.
Available everywhere and relatively inexpensive, rawhides can be a good chew option for some dogs. Plenty of dogs chew rawhides without incident. However, some dogs end up with bits of rawhide lodged in their “windpipe” (trachea), causing choking; or big pieces in their stomach, causing a digestive obstruction. If your dog actually chews the rawhide, rather than biting off and gulping large chunks, they’ll likely be OK — they may even get some teeth-cleaning benefits. This is especially true if you pick up a VOHC-approved “dental rawhide.”
Other animal parts: These may be good or bad depending on the source. When in doubt, ask your vet about the safety of a chew. As a general rule, safer animal part chews include aortas, tendon, gullet, and tripe. Ears are more controversial as they are closer to rawhide as far as digestibility goes (plus, pig ears especially tend to contain a lot of fat). Some animal horns will soften when chewed and fray into small pieces that are digestible, but these should be used with caution.