More so than the Greg vs. Marcia student election, more so than the trading stamps or the lost wallet, even more so than the attic bedroom debate, the disappearance of Kitty Karryall (#7) brought a plague upon the Brady house.
Bobby initially expresses a strong dislike for Cindy's creepy doll, which has been possessed by an evil she-spirit intent on drawing blood. Because Kitty disappears, Cindy blames Bobby. Then Marcia and Jan blame Bobby. And then Greg and Peter blame Bobby. Even Special Guest Star Heather Locklear blames Bobby.
Ultimately we learn that Tiger confiscated Kitty, along with Bobby's kazoo, Marcia's sneaker, and Fluffy the cat. But before Bobby is vindicated, the household is shaken thanks to the demonic doll.
How else could you explain the ease with which Bobby is fingered even though there is not a single shred of evidence suggesting he trashed Kitty? And does it take a mere doll for Greg and Peter to turn on their own flesh and blood? And what really caused Alice to burn her roast?
Kitty, my friends. How else could you explain such feuding over a doll dressed like a patch-work hobo (who, with her evenly measured pony tails, bears an eerie resemblance to first season Marcia)? Tiger was simply trying to protect the family he loved by stashing Kitty in his doghouse.
And I believe that is why she ultimately disposed of him.