While 500 dps may seem an incredibly low amount for WOW Classic TBC Gold one boss, it should be over 1k if given similar conditions (fast kill times, maximum buffs) and if they own any equipment.
As a wild tank, I am averaging 400-500 DPS. Wearing the dorky level 40 hat, you should be in a better cat appearance. If you're not, then the other person has the right idea. Tank.
Feral tanks can switch DPS to buy WOW TBC Classic Gold racks for items and tanks can swap DPS to item racks and DPS cats can do in a matter of minutes. The difference in talent between tanks and the best DPS cat is just two or three points. It's not worthwhile to focus on the feral DPS.