All Dog Breeds: My5 month old puppy's teeth are dropping and new teeth are growing. He lov... My5 month old puppy's teeth are dropping and new teeth are growing. He lov... ================================================================================ admin on 29 April, 2007 02:00:00 My5 month old puppy's teeth are dropping and new teeth are growing. He loves to bite tables and chairs now. Is this normal? Any suggested extra steps to take?