noncat

plural noncats

1. That which is not a cat.

   […] the observation that something is black would not suffice to identify it as a (black) cat since many noncats are also black.

   1987, Ronald W. Langacker, Foundations of Cognitive Grammar: Theoretical prerequisites

   1 more example

   Cats will even copy noncats. One evening my daughter spent an hour teaching her poodle to sit on a child's rocking chair and rock it […]

   2002, Karen Pryor, Don't shoot the dog!: the new art of teaching and training