All right, guys...this is it--Ratoukhit, the riding hound seen in The Desolate Vigil
, is finished!
He doesn't actually have neck ridges the way a person from Cardassia would; those scales wrap all the way around the neck, and their purpose is to keep other animals from sinking their teeth into their throats. They come down the back of the neck and form a diamond-like shape in the area that they start.
The ridge you see moving down the chest widens out into another of the inverted teardrop shapes between the front legs (this is around where the hound's heart is and is due to the way I see the biolectric sense as working).