Dog lovers should watch this documentary streaming on Netflix. It's pretty amazing. Did you know that when a master pets his/her dog, they both experience a release of oxytocin to their blood? Oxytocin is the same neurotransmitter in the brain that a mother releases during breastfeeding which nurtures the mother-child bond.

http://www.youtube.com/watch?v=5rOIRSHoc7k