Lots of bugs can eat your house! The most common ones are: termites, carpenter ants, carpenter bees, powderpost beetles, old house borers and wood mites. All of them are disliked by homeowners and are generally considered unwanted pests.
cats
Cat
Depends whats in the house.
As it was said in 'House,' "Everything that lives, eats." "Everything that eats, poops."
Cats
a fly eats by its feet
a bigger house spider, lets call it a mansion spider
The common black house spider eats redback spiders. This probably explains why redbacks are uncommon inside the house. Both redbacks and black house spiders are shy (especially the redback). A house spider will get to recognize you if you feed it ;)
Termites eat wood!
The house Hippopatomous, extrememly deadly
small animals
house cats, snakes, hawks, and owls are a few.