Since they only were recently fleshed out the Cave Hounds haven’t changed as much as their daylight-loving cousins.
Cave-Hounds have developed from Mountain-Hounds a long time ago and are one of the so called “lesser” Hound groups, as they are comparably rare and actually never to be found anywhere else except on Ileyeah.
Due to their subterranean lifestyle their eyes started to regress. Instead they developed sensible sensory organs in the face to aid their already excellent hearing. The bioluminiscence in their skin is mostly used to encourage plants to grow underneath the earth.
Cave Hounds are pacifists and not prone to engage in any kind of conflict with others.