Pantran whitefangs, also known as ice cats or snow cats, were a non-sentient feline species native to the planet of Hoth

Hoth Planet

. They had the characteristic of having their bodies composed for the mostly of muscles. These felines did not store any fat, and consequently had to constantly be on the hunt. On Hoth they were the only creatures capable of matching the speed of a tauntaun

Tauntaun Creature Non-sentient

, making them their only "active" predator.
Despite their ferocity, whitefangs could be tamed and trained - for example White Maw

White Maw Organization Planetary and Sector

pirates were known for keeping whitefangs as a guard creatures, and the Terror Brigade

Terror Brigade Organization Planetary and Sector

even bred particularly ferocious specimens for the Onslaught.