Depends. You you have permission from your girlfriend to keep those videos and did she consent to being beaten up? Furthermore, did that dog die of natural causes before you used it to beat your girlfriend? If you can answer 'yes' to all these questions then those videos should be legal, shouldn't they?
It was a frozen imported mail order Jack Russel, My girlfriend didn't complain about being hit with the Jack Russel (I think the first blow broke her jaw and I should probably have defrosted it first). I don't think she has a problem with me keeping the videos as I said I could post them to her at her mums but she declined.

SO Katja Single ? Mwahahahaa