Cu-Sidhe are an elven breed of canine. Their fur is patterned like tree bark, giving them excellent camouflage; so long as one remains still, there is only a 10% chance it will be detected in forest terrain. Even indoors, underground, or in non-preferred terrain they are able to hide such that there is only a 30% chance of detection. They have Darkvision with a 60 foot range, and particularly acute canine senses. As with most canines, they prefer to attack as a pack, and will generally avoid combat if met singly.

Most cu-sidhe are much like other wolf or dog breeds, loyal and obedient pets and working dogs.