dog
a domesticated canid, Canis familiaris, bred in many varieties
cat
a small domesticated carnivore, Felis domestica or F. catus, bred in a number of varieties.
alligator
either of two broad-snouted crocodilians of the genus Alligator, of the southeastern U.S. and eastern China.
URL
-http://www.w3schools.com/TAGS/tag_dl.asp