I've blogged a lot about American Sign Language lately and here's one more that's sort of on the topic.
We once had a deaf Dalmatian dog named Brenda who learned to understand lots of signs and taught us some signs dogs use. Some of those are even used by other animals and birds.
For example, shaking all over, like shaking off water after getting wet, means "finish" and many creatures may do it when they're glad something is finished or sometimes if they want it to be over. The ASL sign for "finish" is like flicking water off the fingers and was probably derived from the animal sign.
I wrote a story about Brenda and an amazing thing she once did and it was recently published in the new Chicken Soup for the Soul book, I Can't Believe My Dog Did That.
Amazon and in most bookstores. Of course there are lots of interesting things in the book other dogs did as well.