Call him Jack. If you observe one or more of these signs:
1) Viciously tearing apart cereal boxes followed with devastating blows to the delicate flakes. Jack is a natural born cereal killer.
2) Scratching and tearing at upholstery. This may also include expensive fabrics that we use to hide our modesty (aka clothes). Likes to rip things apart.
You can submit a name change and add "The Ripper" to his name.
Since it is almost a certainty that #2 will be the case, it is cheaper to just go ahead with the longer name.
Or, how about Katmandoo? When an inquiring mind wants to how the name was chosen:
"Well, Katdooman sounds kinky. Mandookat sounds kinkier. So Katmandoo is better because it can beither Nepal's capital, or my cat likes to eat Korean Mandoo (dumplings)."