The hides do contain messages. What I have been able to locate on the forums are the following. Some are hound hides as well.

Kwellen
Kwellen and Hound?
*sigh* I had another tab open with another potential link but accidently closed it. I used kwellen hide for search term. Guess these two will be a start for you, think the other one just had hound hides on it.

I couldn't find a list for all the hides. I tried searching the wiki but me and the search engine just don't get along on that site. I can't even find things I KNOW are in there with it.