Sketches on the top left: Done by  manedfiredrake
Colored stickers on the right: Done by  Appletail
middle and lower left: Done by me.

A study of the mimic dog since people seemed to have a hard time drawing this little guy.

the head does not extend outside the area of its body. it is Strictly chest shaped.
Stomach can stretch a little, but only as much as shown. It cannot stretch to the point it lifts him off the ground. Maintains his shape.