How do dogs recognize each other or gain an understanding of the world around them? Alexandra Horowitz, a leading researcher in dog cognition and author of “Being a Dog: Following the Dog into a World of Smell,” joins host Hari Sreenivasan to explain how smells change a dog’s perception in surprising ways.SciTech Now airs weekly on public television stations nationwide (check local listings).For more for more stories like this visit scitechnow.orgLike us on Facebook: facebook.com/scitechnowFollow us on Twitter: @SciTechNowJoin the conversation with #SciTechNow