SCP-6663 is a Euclid class entity, also known as Dog-Day. While not much is known about it, many have reported seeing it alongside an unusual being similar to 66663 in appearance, however purple. Said similar entity is now labeled as SCP-66663-A. SCP-66663-A emits a red smoke which is known to cause hallucinogenic effect and, in some cases, temporary paralysis or passing out. SCP-66663 by itself is harmless, but SCP-66663-A is not. Thank you for reading this informational lecture from the SCP-Foundation.
