Need quick Supernatural story help!

Can anyone out there give me some quick help?

Is there a supernatural or folk-lore creature that is animalistic (like canine) in nature that preys on children?

And if nothing like that exactly fits the bill, how about something other than a werewolf or black dog/hellhound that's canine in nature? I was originally going to use a black dog in my story, but the more research I did, I couldn't find a single hint as to how to kill one, since they appear to only be omens of death and not physically real. And I need something that Dean can actually kill.

Thanks!!