Question: are all hoofed animals related?
Answer: One traditional grouping of mammals, the Ungulata, is now recognized as a paraphyletic grouping; that is, it contains some, but not all, descendants of a common ancestor. ... The two major groups of living hoofed mammals are the Artiodactyla, or cloven-hooved mammals; and the Perissodactyla, or odd-toed mammals.