The Secret Language of Dogs: Unlocking the Canine Mind for a Happier Pet by Victoria Stilwell is a great source for info on dogs, such as info on their use of senses to their behavior, including quirky ones. The photographs are wonderful, too.
Stilwell asks that we never stop observing our dog’s behavior because it’s their language and we could build our relationship with them the more we understand the things they do.
Also recommended is to give them plenty of exercise and training. Training doesn’t have to stop after they’ve learned the basics as a puppy. keeping an agile mind is good. maybe show them a good trick, take them to training classes, take them on a hike or other.
Victoria Stilwell is CEO of Positively Dog Training (VSPDT), author of books and articles about dogs such as It’s Me or the Dog, has an Academy for Dog Training & Behavior, is editor-in-chief of Positively.com, and so much more!