The picture on this post likely depicts a seeing eye horse: http://en.wikipedia.org/wiki/Guide_horse http://en.wikipedia.org/wiki/Guide_horse Here's the advant

The picture on this post likely depicts a seeing eye horse: http://en.wikipedia.org/wiki/Guide_horse http://en.wikipedia.org/wiki/Guide_horse Here's the advantage: both dogs and horses require years to train in this capacity. However, horses then live much longer than dogs, maximizing the value of the training time invested in them. Plus, they're extremely cute.