Dash is Crank and Kathy's (Kirk and Kati's) alien dog back on the planet of Eden (First image). The Archivist's Crew brought him to Earth because they couldn't leave him alone.

Dash can also speak English and outside the Sanctum it looks like a regular blue-grey dog which calls itself Spot so it can hide it's true form. (Second image).

Dash takes the form of the 1993–2009 Blue Jr dog in from the various Nick Jr animal outros sometimes in the Sanctum. (Last image).

Dash was originally going to be the Warden of Obey but then I scrapped the warden idea and thought of him as an Archivist companion. Also Dash was originally created by Owlkangaroo11 but modeled and concept by me.

Also please do not call him Stitch. He's NOT Stitch from Lilo and Stitch.