Does jealousy exist in dogs?
With a study, a book, and a blog, there are several scientists that
believe so.
Study Finds, Dogs Understand Fairness, Gets Jealous
Proceedings of the National
Academy of Sciences
http://www.npr.org/templates/story/story.php?storyId=97944783&sc=emaf
Dr. Patricia McConnell ‘s article on canine cognition
otherendoftheleash.com/category/canine-cognition/