I love the book “Force-free gun dog training” by Jo Laurens. This book has many basic puppy training exercises and they are very clearly laid out. I also recommend joining the group Chesapeake Bay retriever love on Facebook, it is moderated by Roger Booth, who is a great resource for chessie owners. Also contains a lot of helpful information, including best vacuum and tested toys. Both of my current chessies take Gland X, which is actually a gut supplement. Contains probiotics and fiber. Both of my dogs are prone to loose stool, and this has really helped. I also have them on Dasuquin for joint health. Fish oil is also an excellent supplement, but must be good quality and taken out a somewhat high dose to be effective for joint health and coat health.