A shaggy, large black mongrel, born in the laboratory where inhumane experiments were performed on him and his companion, Snitter. Snitter escapes with Rowf, only to find that living in the great outdoors is quite challenging. Rowf is a downtrodden fellow, quite cynical and increasingly feral in his ways, since he has had a hard life and never met a decent human. As a result of the experimentation, he has gained an abnormal fear of water. Toward the end of his travels, his time with Snitter and his encounter with real-life naturalists Peter Scott and Ronald Lockley has him believing humankind may not be irredeemably bad.