Feeling warm on a cold day...

This morning on the local news, they had a report that was pretty damn cool.  It was about a blind dog who had his own guide dog...I had never heard of that before!  Was this common?  Had I been living under some sort of ignorant rock?  Apparently, I had been, to some degree.  I got on YouTube to see if there were any other videos like this and - yep, there were more examples of heartwarming tales like the one I saw this morning.

Besides the ones featuring one dog leading another dog around, there were even examples of a cat leading a blind dog around.  But the one that really got me was the story below (looks to have originally aired about a year ago):