Uh is you're talking about a pet. a cat is is a domestic species of small carnivorous mammal and a dog is Canis familiaris when considered a distinct species or Canis lupus familiaris when considered a subspecies of the wolf) is a domesticated carnivore of the family Canidae. It is part of the wolf-like canids, and is the most widely abundant terrestrial carnivore.
The Oxford English Dictionary is best for finding the "Descriptive" meaning. This is the literal meaning, known also as denotative. It can also help you with figurative meanings, but it is not its primary purpose.