Do you have any cats?
Of course I have a house cat and i call it house cat because i keep it as an indoor pet
Do you ever allow it outside
Of course no. I love its companionship  and its ability to hunt vermin.
What kind of vermin
Whichever type that are pests or nuisance animals that want to spread diseases or destroy my food 
They are good protectors then it sounds like
registries.
Cats are similar in anatomy to the other felid species, with a strong flexible body, quick reflexes, sharp teeth and retractable claws adapted to killing small prey. They are predators who are most active at dawn and dusk (crepuscular). Cats can hear sounds too faint or too high in frequency for human ears, such as those made by mice and other small animals. Compared to humans, they see better in the dark (they see in near total darkness) and have a better sense of smell
Lists of cats
The cat ("Felis silvestris catus"), also known as the domestic cat or house cat to distinguish it from other felines, is a small carnivorous species of crepuscular mammal that is often valued by humans for its companionship and its ability to hunt vermin.
Lists of cats include:
- List of cats – individual notable cats
- List of cat breeds
- List of experimental cat breeds
- List of fictional cats