Secondly, if none of those fit, you can change the image in the Configuration Program (Movies->Movie Database->Coverart), and set a url of a picture you would prefer (MediaPortal then downloads the picture and caches it on the hard disk for future use).
ASiDiE said:Unleashed is called Danny the dog. I had the same problem with that movie. You can check it out here:
http://www.imdb.com/title/tt0342258/