Here is a picture of a puppy I found while browsing reddit, training to be an assistant dog. Doesn’t he look so sweet? I believe he is a yellow labrador retriever, but I could be wrong. Many years ago, I was waiting for the metro when a blind woman passed with a seeing eye dog: the same breed as the one below, in fact. This dog was fantastic. He sat and waited until the metro came, very patiently, and gently guided his friend to the metro when the doors opened. You could tell that there was a very special bond between the two of them.
Many thanks to all the excellent assistant dogs out there, and the people who help to train them!
Found here: Imgur