currently we have red hounds and blue hounds, but there are so many more gems they could add hounds for!
purple hound would make you insane
green hound would attack structures
purple hound would make you insane
yellow hound would be very fast'
orange hound would teleport and attack with sand spikes
white hound (opal gem) would make it very cold so they're like super ice hounds. they should only spawn very late in the game after the moonstone event has been completed
(i know the unnatural selection mod has similar ideas but i swear i didn't copy them... i copied the blue and red gem themed hounds from the main game but applied them to all of the gems. swear)