Hi again, Dawna, and you're most welcome; thanks for your reply and your accept.
I'm glad you mentioned he has been neutered recently; yes, this will help him calm down; it sometimes takes a couple of months for the testosterone in his system to be completely out, after neutering.
I would suggest only putting plain water in the spray bottle, but you can also use the can of pennies/pebbles, technique, and remember to stand out of sight, so he associates the BEHAVIOR and not YOU, with the startling noise. Keep him on a leash/harness in the house, when you have visitors, so you can control his movements and do your training with him.
The only homeopathic product I would recommend is Rescue Remedy for Pets. Just one or two drops in his water or as directed on the bottle.
I would not recommend any other sedative medications for one so young, but you can discuss this with your veterinarian, who knows your pup's medical history.
Cher (please do not click 'accept' an additional time, as I'm happy to follow up with you)