Ponies: An herbivorous, herd based, female dominant, highly pacifistic, planet bound society.
Kzinti: A carnivorous, male only (the females aren't sapient), extremely aggressive, space faring military culture.

When the lone scout ship Thrak-Shan is sent to investigate a White Dwarf orbiting a planet, the crew find themselves overlooking Kzin paradise. The world, dubbed Tetra due to the dominant lifeforms being quadrupeds, is rich in untapped resources. On top of that, its wilds are full of wonderfully dangerous prey, and its inhabitants are ideal slave material. The only problem would be convincing their superiors that such a planet even exists, so of course, they enslave one of the locals and take it back with them.

Crosses over with Larry Niven's Man/Kzin Wars series.
Cover from Man/Kzin Wars Volume IX.

Tagged for gore because Kzin.