Watch How I Met Your Mother: A Change of Heart Season 06 Episode 18 Online

How I Met Your Mother: A Change of Heart Season 06 Episode 18, Summary: When Barney starts to have real feelings for Nora, he worries that there is something wrong with his heart. Meanwhile, Robyn starts dating a guy who acts a lot like a dog.

This series will be aired on Monday on 28 February 2011 at 08:00 PM on CBS.