He would most probably die depending on how severe it was. Jacob said in Eclipse that if a vampire bit him, or one of the other shape-shifter, it wouldn't kill him, but if he already had a cut of something to that affect(combined with the venom) that could be fatal.
If a vampire in the Twilight universe bites a human, the latter will turn into a vampire (unless the venom is taken out, as happened in Twilight with Bella, James, and Edward), but if a vampire bites a werewolf, nothing will happen to the latter.
When they phase into a wolf for the first time, they stop aging. There are plenty-a-plot-holes here BUT if Jacob maintains a regularly scheduled shape shift, he can essentially stay young forever. This is a good thing because Renesmee will be Jacob's age physically in a mere few years.
The process is known to be slow and painful, described with the feeling of being burned alive. When a vampire is bitten by another vampire, the venom from the teeth will create a permanent bitemark usually invisible to human eyes, and the pain is supposedly stinging but eventually passing.
Werewolves bite vampire arms, legs and necks. A vampire crushes werewolf Jacob, who changes into his human form and lies on the ground writhing in pain. The bones in the left side of his body have been shattered.
Edward's got the upperhand in mind reading and MAYBE speed, while Jacob's got the upperhand in overall strength. I said that Edward might have the upperhand in speed but might not, because although he's the fastest Cullen, werewolves are faster than vampires in general, and it's not like Jacob's slow at all.
He won't tell her what is wrong. He says he can't see her anymore. If he'd imprinted on Bella in that moment (and it happens the first time you see the person after you've phased), he would have answered all her questions. Pretty much, he would have given her anything in the world she wanted.
While Jacob insists his feelings for Renesmee (Mackenzie Foy) will remain completely platonic until later in her life (as does Twilight author Stephenie Meyer), Bella (and most of the fandom) find their relationship to be unsettling at best.
Just before Jacob almost kisses Bella, he says "Kwop kilawtley," which means "stay with me forever" in Quileute.
Science has failed us. Who could have guessed, in an analysis of the hotness of a vampire and a werewolf? Thus we rely on the experts in the field (here defined as posters on the various message boards, blogs and the like). A casual survey reveals a majority finding that Edward is prettier but Jacob is brawnier.
Leah and Jacob are the fastest members of the pack, closely followed by Embry.
Like other vampires, Edward is not able to sleep. In addition to the traits he shares with his fellow vampires, Edward has certain abilities that are his alone. He possesses superior superhuman speed compared to that of other vampires and is the fastest of the Cullens, able to outrun any of them.
Jacob is extremely insecure and does a lot of abusive things to Bella. This isn't to say that Edward was a saint as he did some messed up things, too, but Jacob was often out of control. He would use his emotions to manipulate Bella to try to get her to be with him.
His wife, Sarah Black, died in a car accident when Rachel, Rebecca, and Jacob were young. He resides in La Push, Washington, and is confined to a wheelchair due to complications from diabetes.
Jacob will live as long as he keeps phasing and he won't stop as long as Ren is alive. So technically he CAN live forever but he could also be killed by a vampire, another wolf-shifter or Ren could die by one of those and Jacob would stop phasing and die of old age.
In the world of Twilight, vampire women are unable to get pregnant because their body can not change to hold a fetus. But men are apparently able to get human women pregnant.
Bella's gift is her very powerful shield – one that has been growing and working without her knowing since she was born. Because of her shield, she is protected from powers of the mind – that means that Edward (and Aro) can't read her thoughts, Kate can't shock her, and Jane can't cause her pain.
If a vampire is torn to pieces and the pieces are not burned in the fire, the vampire can reconstruct themselves as if no damage occurred, with no sign of harm. Vampires can also use their saliva which is also venom to accelerate the healing of their injuries.
The Cullens are safe again, and Renesmee is able to stay with her family. Nahuel states that Renesmee will probably reach complete physical maturity around seven years after her birth, at which point she will stop aging and live to an unknown extent of years.
Because Jacob has imprinted with Renesmee, Edward breaks Jacob's arm and throws him at a wall to keep him away from fighting the other werewolves.
Seeing as she's half vampire, one would think she would age much slower than humans, since vampires can't age at all. However, poor unloved Jacob shouldn't have to wait eighteen years for his happily ever after, so Renesmee grows abnormally fast, and will magically stop aging once she reaches sexual maturity.
Werewolf-Vampire Hybrids, also called Were-pires or Vaewolfves, are the mixture of both a vampire and a werewolf. They possess the powers of both species, making them twice as powerful.
The longer a vampire abstains from blood, the more likely the vampire will lose their rationality and mental faculties until they give into their thirst, because their throats are described to be in "burning pain", which will worsen the longer they do not drink blood.
Remember Nahuel that Alice/Jasper brought to the clearing? He was around 150y. From the official guide that SM wrote & released: "once a werewolf transforms, his aging speeds up until he reaches the age of maturity, roughly twenty-five. At this point, as long as he continues to phase, he remains at that age.
Edward also displays many stereotypical characteristics of abusers. First, one of his hallmark characteristics is his control over Bella and his attempts to isolate her from others. Abusers often use this tactic as a way of ensuring that their victims have no way to escape should they attempt to do so.