User blog comment:Twilightslastgleaming/What If: Jacob Black-Cullen/@comment-1884241-20100323005501

I think becoming a vampire would stop him from becoming a shape-shifter. The above occurs while he is still 100% human, and we know that the shape-shifter change is not inevitable - as with Billy Black. Becoming a vampire freezes you in your current form, just as you were at the time of the change. So Jake would remain a short, skinny, 16 year old kid like Taylor, and never become the towering monster he is described to be in the books. On the bright side, he would be more powerful than his shapeshifter counterpart. He would likely have no special abilities, unless his dormant shapeshifter genes granted him senses heightened beyond those of a normal vampire - in which case he would be an amazing tracker.