We really don't know what Shamoo looks like. Therefore it could be Shamu. The only thing we have to go on is Malibu's spelling. Since she is Shamoo's owner... we have to accept her spelling.
My only problem with the whole story was that Shamoo was getting more action than I am... hmmm good ole Shamoo and all of those nearly naked females jumping and sliding off of him. Ut oh, wait a minute... have we determined if Shamoo is male or female? This couldopen up another whole discussion.