Item #: SCP-XXXX
Object Class: Safe/Keter (Dependent on form)
Special Containment Procedures: SCP-XXXX has free access to Site-██. If the form seen in the second picture is activated, sedate immediately and place back into its cell.
The 10x10x10 cell is to be reinforced with a 6-inch tungsten layer. When 2nd form is activated within the cell, lock both the human entryway and the doggy door. Fill its water bowl every Monday. Fill its food bowl every day at 7 am and 5 pm. Try to keep as content as possible for safety reasons.
Description: SCP-XXXX: Form #1 is a basset hound of unknown age named "Ace." He is not very anomalous, although it is believed to be invincible, and the evidence behind this claim is quite solid. During a containment breach of SCP-00██, SCP-10██, and SCP-00██, SCP-XXXX was free-roaming and was accidentally put into the same cell as SCP-049 by Agent ██ (Fired for incompetence) and video footage shows the SCP grabbing Ace in a failed attempt to kill him. This, and the transformations, are the only anomalous features.
SCP-XXXX: Form #2 is wolf-like in appearance, with yellow eyes and spikes made of bone. Lengths range from 3" to 2' and completely hollow. The exact strength of SCP-XXXX is unknown, although it was able to break 10 inches of steel in 5 hits. Tungsten is the only metal able to hold it back. It is able to breathe fire and has completely melted multiple food bowls. Strangely, it has never used its breath in an attempt to escape.
Discovery: Rumors of the Hell hound have floated around the rural community of ██████, Oklahoma for nearly a century, further proving the immortality theory. When a farmer installed a security camera near his sheep pen, he caught the image used above and reported to it the local police. After 5 armed officers died, the military got involved and shipped it here.
Further research into the local legend states he was born a normal basset hound, and Jim █████ sold it to a woman in the forest. The woman in question, if the legend is to be believed, was a 'witch.' She cast a spell on Ace that made him transform into a demon when angered. This did not end well for the witch. When she scolded him for running off, he got insecure and killed her. We are unsure if the legend is to be believed or not. He survived alone in the forest for around 80 years since, and has a 3 recorded kills.
Incident 1-A
Ace is put into the same cell as the witch's corps.
Ace instantly activates.
Agents █████ and █████ try to tranquilize SCP-XXXX
Ace kills both of them in less than 15 seconds.
Agent █████ successfully tranquilizes SCP-XXXX
Incident 1-B
Ace is free roaming.
Dr.███████ steps on Ace's tail.
Ace activates after yelping.
SCP-XXXX eats Dr.███████'s leg.
Ace is shot with tranquilizers from several different directions.
Dr.███████'s leg has been replaced.
Incident 1-C
Ace activates for an unknown reason in his cell.
Cell is still older model with steel walls.
SCP-XXXX tears open the walls and melts his guard to death, Agent ████.
SCP-XXXX is quickly tranquilized and dragged into SCP-█████'s cell for safe-keeping while the walls are repaired.
Incident 1-D
[REDACTED]






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