Wasn't there sound direction indication arrow in the upper right corner box when the shout happened?
There should be, but I'm not sure. Can you pick the actual message from the logs still?
Shouts to companions could be reasonable addition, dogs can shouted to come back at you. Adding "Bark if you hear me!" command for dogs feels a bit off. They keep barking with prey and some other important events anyway and are easier to find that way.