There was once a rumor or theory that you can identify how rare your pet is by its eye color. This, however, might be viewed in different ways. The first theory was that Hasbro made rare pets with certain color of eyes, and the common pets with a certain color of eyes. However, this theory could easily be proved wrong with the fact that rare pets such as Daschund #675 have commonly colored eyes. Therefore, it can be argued that the toys were not purposely made with rare eye colors to signify if the pet is rare.