i think they most probably would become a vampire animal because they have the same insides and blood circulation of a human.
though there has never been one because they only bite animals when they are hunting and when you hunt its hard to stop.
I wouldn't think so. In the Official Illustrated Guide, it says, "An exception to this rule [about the werewolves' healing] is vampire venom. In a werewolf's system - whether he [or she] is in his [or her] human or wolf form - venom does not begin the process of transformation into a vampire. Rather, it acts as a poison that retards the healing abilities of the werewolf. Venom alone will not generally kill a healthy werewolf; however, in combination with other injuries, it can be fatal." That's only for werewolves, though. I'm sure if it were any other type of animal, it would simply die.