The structure of the canine spine consists of the following vertebrae -
7 cervical (neck)
13 thoracic (upper and mid back)
7 lumbar (loin)
3 fused sacral
**6 to 23 coccygeal (tail)**
A bobtail Catahoula with a shorter type (stubby) tail has 6 coccygeal vertebrae.
Only the #6 vertebrae is visible and can be felt coming from the body.
Dogs with an approx. 2” bobtail have 7 coccygeal vertebrae and so forth.
There has never been an instance of a bobtail Catahoula being born without
the required minimum of 6 coccygeal vertebrae - a full spine.
Bobtail with 6 Coccygeal Vertebrae
Bobtail Catahoula with 7 Coccygeal Vertebrae - Approx 2” Tail
Bobtail Catahoula with 6 Coccygeal Vertebrae - Stub Tail