Because it would get lost in this mess and die and start to stink.
But the stench might kinda' blend in with the preteen boy's room.
Look. There are things I don't kid about and this is one of them. When I say my children's rooms are so disastrous I trip over things every night when I go to tuck them in, I'm not exaggerating. (I did say this to someone recently so I'm just providing proof.)
And seriously, this is why we can't own any animals smaller than cats. If you look really closely on the right-hand side of that pinkish pic up top you can probably spot Whiskers The Cat curled up on Rachel's bed.
So guess what we're doing this weekend?
Hint: we're not getting a hamster.