Boredom, anxiety, frustration, or excess energy may be common triggers. Some dogs suffer from separation anxiety and once left alone at home will resort to chewing half a house apart. If you recognize any of these behavior issues try to address them properly. A dog behaviorist may be necessary for severe cases. However, many times all it takes is taking your dog out more to release the extra energy and help relieve the boredome. This is usally the path towards happier and more relaxed dog.
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.
Indigestible chews like hard plastic or nylon chews: As a rule, any chew that is indigestible has a high chance of causing a gastrointestinal blockage or indigestion at the very least. Hard plastic or nylon dog chews are often too hard and can damage teeth. In addition, they develop rough edges when chewed that can cause injury. These toys are not digestible and cause GI obstruction or damage if eaten.