Someone did put it, and for sure it was Admin because he is the only one who have acess to the database, when something new is added to the database, Admin post in a hidden forum what does it mean and ask all moderators to translate it to their own languages and add it in each forum.
It didn't happen yet what make us think that Admin was having problems enough and have had no time to post it at the moment.
Also there is the possibility of the informations be wrong, as there was an server crash not long ago which messed up with several informations.
I was searching for more dogs with the symbol (_!_) and I found Fallko Kollarov dvor with this mark, i'm quite sure he isn't a mix, then we really need to wait Admin explain what does it mean.
PS: Out of my fertile imagination, for me this (_!_) will be ever a butt!