The Goth Manor lot is not in The Sims 3 Pets for Xbox 360. The console version shipped with a limited lot catalog and no DLC / Store content support (unlike PC/Mac).
| Feature | Xbox 360 | PC/Mac |
|---|---|---|
| Lots Included | ~15 | 50+ (base) + Store + CC |
| Create-a-Style (CASt) | Yes | Yes |
| Store / DLC | No | Yes (hundreds of items) |
| Mods / NRaas | No | Yes (essential for stability) |
| World Editor | No | Yes (CAW tool) |
Verdict: Build it yourself on 360, or switch to PC for the authentic Goth Manor + infinite custom content.