Jack Jack

From OAPedia.com

Jack Jack is the name of Anthony's cat, given to him by Steven S from Bayshore. Whenever cats or Steven S were mentioned on the show, Anthony often used it as an opportunity to bring up Jack Jack, much to the annoyance of Opie. He also liked to scratch li'l Jack Jack under its chin and go "shooka shooka shooka".

Anthony no longer owns Jack Jack, as he is now single (the cat was his ex-girlfriend Mellinda's idea).