Cats are cats, unless you have a specific breed of cat. If I say "I have a dog", most people will say "OH, what kind?". Cats, not so much. When you say "I have a cat." People presume it is the typical house cat of various colorings. If you have a specific breed of cat, then one might be more specific and say "I have a boxer/pit and an Ocelot." or "I have two Siamese." Again, because otherwise it is naturally understood your cats are the common house cat. *In my opinion.
Now one of my cats is supposedly a Burmese, but the other two are typical mutt American Short Hair meowmeows.