As it happens, House rescued the rat from his ex-girlfriend's attic earlier this season, so it wasn't as if he went to the store and bought one instead of two (surely the pet store owner would have pointed out to him that rats ought to come in pairs). That's sad that Steve must be lonely. However, House is grouchy and lonely, so he probably figures Steve ought to be, too.

Still waiting on that photo for you. Part I caps are up but not Part II. Stay tuned.