I have a few favorites...
The Other End of the Leash by Patricia McConnell (Great insight into the brain of a dog also discusses compassionate training methods)
The Newfoundland Puppy: Early Care, Early Training by Judi Adler (A MUST READ in my opinion
Outwitting Dogs by Terry Ryan and Kirsten Mortensen (structured around solving common behavioral problems)
The Culture Clash by Jean Donaldson (I hate the author's tone and writing style. Also, the lack of organization in the book is annoying, but there are some excellent ideas in this book that made it extremely worthwhile to me. Since I had been warned in advance about the author I just ignore the writing and focused on the little jewels buried in the book. I really disagree with the lemon brain part :lol: )
I don't think I agreed with any of these books 100%, but I just took what rang true to me and left the rest behind.
I'm interested to hear what books others like. I'm always looking for something new to read that might benefit my Newfs and our relationship.