- Cerberus was the tri-headed dog that guarded the underworld in Greek mythology

 - 99.999% of calico (3 colors) cats are female. Only 1 in a million calico cats are male. Only 1 in 10 million calico males are fertile. The rest are sterile and cannot reproduce

 - The Wizard of Oz's Toto was played by a female Cairn Terrier named Terry

 - In Oklahoma, dogs must have a permit signed by the mayor in order to congregate on private property in groups of three or more.

 - The Basenji is the only dog which does not bark.