by Coren, Stanley.
Inside of a dog : what dogs see, smell, and know
What's a dog for? : the surprising history, science, philosophy, and politics of man's best friend
Dog is love : why and how your dog loves you
Are we smart enough to know how smart animals are?
Doctor dogs : how our best friends are becoming our best medicine
Dog sense : how the new science of dog behavior can make you a better friend to your pet