"oh me? I got a cat named Dobby, he's fat and likes to sleep on my bed all day and chase after the other cats at night, I guess"  Chris says not really all that sure about what exactly the feline did besides sleep.  it certainly didn't help him with spells like a proper Familiar would.  It disappeared for hours on end durning the evening and returned occasionally with a mouse to put by his pillow, or some other 'gift'.  But really it slept mostly.