Per 
Item #: SCP-5109
Object Class: Safe Euclid
Special Containment Procedures: SCP-5109 is allowed to roam around Site-19, but has to be accompanied by at least 1 guard at all times. SCP-5109 bowl is to be refilled every day. If SCP-5109 is damaged at any point in time, lockdown is to be initiated until SCP-5109-1 has returned to a docile state. SCP-5109-1 is to be contained in a 5 x 5 x 5m standard humanoid containment cell. A computer is to be placed inside the cell. At no point in time is the computer allowed internet access, in case of an information leak. Games are to be rotated every 3 months, as to not cause boredom or depression to SCP-5109-1. 1 guard is to be stationed outside SCP-5109-1's cell at all times. Interaction with SCP-5109 or SCP-5109-1 is allowed for any staff member (Excluding D-class personnel).
Description: SCP-5109 is a dog, at around 5 years of age. It is a Beage type breed, though it's appearance change per person. The most common version people describe it is a Beage dog, with white and brown colors. SCP-5109 appears as a normal dog and acts like one as well. It enjoys playing with staff, wanting them to throw a ball it carries around, it enjoys to chew on bones, and bonds quickly with staff. It's anomalous properties first begin to show when it is damaged. When damaged, it begins to rapidly regenerate. This regeneration is similiar to that of SCP-682, albeit slower. It can regenerate from any type of damage, even fatal ones. Also, after around 10 - 15 seconds, SCP-5109-1 will activate.
SCP-5109-1 is a 13-year-old European human child, weighing ██, at 1,50 meters in height. Like SCP-5109, SCP-5109-1 acts as a normal human child. It enjoys playing videogames, watching comedies, and anime. SCP-5109-1 is capable of speaking, and enjoys interacting with personnel. It's intelligence is average for a normal kid of their age. SCP-5109-1 has the same regeneration powers as SCP-5109,however, SCP-5109-1 takes longer to regenerate than SCP-5109. When SCP-5109 is damaged, it causes a reaction in SCP-5109-1, who will appear to be in distress. SCP-5109-1 will begin to scream at around 90 db. After around 10 - 15 seconds of screaming, SCP-5109-1 will begin to run towards SCP-5109's last location. This means that if SCP-5109 was moved during these 10 - 15 seconds, when SCP-5109-1 arrived, it would appear seemingly confused. After 5 seconds of scanning the room, he will begin to again run towards SCP-5109's location. This will continue until reaching SCP-5109's location. SCP-5109-1 can run up to 20 km/h, and doesn't appear to get exhausted from running. At this point in time, no material can prevent SCP-5109-1 from running to SCP-5109's location. SCP-5109-1 appears to phase through all matter while running. Upon arriving at SCP-5109's location, he will run toward SCP-5109-21 who last hurt SCP-5109. SCP-5109-1 will begin to kill SCP-5109-2. Upon SCP-5109-2's death, SCP-5109-1 will run back to SCP-5109, and begin to check him. As SCP-5109 regenerates from damage, SCP-5109-1 will breathe a sigh of relief, before returning to a normal state.
Addendum: On ██-██-████, a containment breach at Site-19 occured, breaching a bunch of Safe and Euclid SCPs, as well as some Keters. SCP-5109 was taken back to SCP-5109-1's cell, to protect them. SCP-███ unfortunately gained access to SCP-5109 and SCP-5109-1's cell, and immediately attacked SCP-5109. SCP-███ was later found in the other end of the facility, wounded.
