Riccardo Tisci
Panic over, all has been explained (see my previous post, My Letter to Givenchy Re: Rottweiler Sweatshirt). Riccardo Tisci (designer for Givenchy) actually loves Rottweilers, and would have always wanted one as a kid, I have been reliably informed.
Rottweiler Sweatshirt
The big snarling depiction featured in his Fall/Winter 2011 collection was simply reflecting the his mood at the time. In honour of this new information on the designer and his artistic inspiration, I updated his wikipedia page (see above).