Cyberhounds
Cyberhounds were hostile terrestrial NPCs added in Update 1.115 (early 2016). If enabled in the World Settings, Cyberhounds spawn on the Earthlike planet and attack players and buildings. They are disabled by default because they are buggy.
Description
Wolfs are wolf sized today but Cyberhounds used to have robotic features. They can be killed by Block Weapons and handheld weapons. After being killed, you have a short timespan to loot their corpses for random components.
Attacks
Cyberhounds were replaced by non-explosive[1] more natural looking wolves. If you enable them now, they chew[2] on your ships, rovers, and stations, and attack players at close range. Their pathing and AI is not stellar and they often get stuck on corners.
History
The Cyberhounds' main attack used to be to explode if they could not reach the player. However, Earthlike was supposed to be a safe starter planet for beginners, so having hostile NPCs spawn there wasn't very popular, and many players asked to disable this feature. The massive voxel deformation their explosions caused also affected performance negatively, so they were nerfed[3].
Trivia
In creative mode, a player can use a Medical Room to turn their engineer into a wolf.