No Stupid Questions

Well, obviously it depends on which myth/legend/author is in play.

That being said, vampire myths were not prone to syringe teeth. The bite opens an artery, or just tears a patch out, and the blood comes out either under its own pressure, or assisted by sucking (I vant to suck your blood).

Typically, and I haven't read every vampire fiction piece so ymmv, when syringe teeth are used, it's for injection rather than extraction. Typically some kind of anaesthetic and/or blood thinner, with consumption still being via the mouth rather than the teeth.

Werewolf (or other therianthropes) shedding is less clear cut. In myths, I never saw any mention of it at all. At most, shedding skin entirely, or otherwise leaving behind parts of one shape when transforming was involved, but that was in creatures far away from what could be called werewolf. So, shedding hair like a dog or cat does isn't part of traditional lore.

Unlike vampires, however, it does appear in modern fiction. Most often as a joke or aside, but it is present. The apparent reasoning being linked to how long the individual stays in their wolf/animal form.

In other words, it seems most writers have an assumption that the "wolf" won't shed unless it spends enough time in that shape to have hair reach the end of its growth cycle. However, I don't recall any examples of that applying in reverse. When in human form, it's rarely covered, but the default is that weres who only shift monthly do have normal human processes, including shedding hair as it cycles.

But there are references to both here and there (please don't ask me to remember which books, I have read way too many urban fantasy series to keep track of exactly which author uses what system). Wolves shedding when in wolf form even when only in it overnight does happen. As does humans not shedding hair, or regrowing hair they cut or otherwise lost, after returning to human form.

When it comes to this kind of stuff, there can be difficulty sorting out older myths from those that get passed around now due to stuff like dracula, the old universal movies, etc. Most of the scholarly, historical information is hard to find nowadays. It's buried on the internet, and local libraries are more likely to have secondary works interpreting old lore than direct translations of the small amount of written records of such legends. But it is out there, if you have reason and motivation to slog through shitty ai search results.

Here follows geek/writer stuff, be warned.

Now, personally, I've used both shapeshifters and vampires in both written fiction and rpg play. My choices tended towards a time based factor for shedding. Since hair takes time to be shed in humans or other animals, my default is that any hair or fur is "new" upon the shape change. Thus, shedding would only be a factor after extended time in a shape. Indeed, one version of were-being I use has reduced aging because of that. Each form ages slightly slower than normal by virtue of the thing that causes the power (in my main worlds, it's a magically linked quasi-virus symbiote), and each change hits pause on the other form, leading to life expectancy into the two hundreds or more. However, they would also shed less because the symbiote prefers a stasis when possible. It's linked to fast healing.

Vampires in my main fiction and trrpg worlds are also symbiote virus based. Part of that is being able to inject a bolus of the virus through the fangs at will (and sometimes involuntarily), so fangs are essentially syringes in that setting. I have played around with the fangs being able to suck up blood, but it isn't really viable on a "realism" level (yeah, it's fantasy, but I try not to hand wave bullshit when it isn't essential). The mechanisms for sucking parts in real world animals/creatures just don't match what could work in human sized fangs, much less alongside injection.

That being said, my main universe has a vampire planet. And there are things there that can both suck and inject via the same body part. Larger predators there, which originated before the symbiote got there, developed fangs capable of doing the job. Humans that arrived there were not dominant as a species for quite some time. The large arachnid-ish predators there were particularly fond of human juices. Even after alterations by the symbiote, it took time before the new vampires had the power to be on equal footing, and much longer before they got powerful enough to dominate the planet.

Anyways, that's the geek gush over lol