So for context, the way things work in this setting (horror-fantasy, late-medeval-early-modern-europe) is that werewolves are at-will shifters of implications, for one thing. The fact that humans exist right next to another sentient (if somewhat alien) species has others, in the way ie land-management works. I mentioned 'cultural' effects that the interplay had on the wolves, what sort of effect would it have on human culture?

The weird thing is, werewolves exist in both human and lupine populations. So some human families are werewolves, but there are also families of shifters who live out in the wilds amongst the wolves. These are not two subspecies of werewolf, by the way. In terms of powers and other properties they are identical. A werewolf is entirely capable of reproducing in either form, regardless of which they are 'native' to.

Keep in mind, 'wolves' themselves are a little different than in our world, a little bigger and a little more intelligent. Not quite to human level, but smart enough to 'talk' to and even do business with, if you have a shifter to translate. Domesticated dogs never existed in this world, so some of the practical tasks they did, like hunting and herding, are instead done by 'hired' wolves.

This has some interesting (and horrifying) implications.

One is how the lifespans and what not interact. Regardless of which they were born to, werewolves live, a little longer than the human norm, but mature nearly as fast as wolves. So a human-born werewolf is physically adult after five or six years, and a wolf-born werewolf is basically an immortal from their perspective.

So say that a werewolf is spontaneously born to non-werewolf parents, way out in the deep wilds with minimal human contact. This shifter spends most of her life in lupine form (briefly shifting human for things that hands are useful for), and lives and thinks like a normal (by this worlds standards) wolf. But she still has the human-and-a-bit lifespan. So she has children. Her children have children. Her grandchildren have children, and the genes finally align just right to create a second werewolf. This takes around twenty years. Meanwhile, the first werewolf just had another litter of puppies with her third mate, the first two having both died of old age. By this point, her mate is the only wolf in the pack who is not a descendant of her.

It can get weirder. Imagine the second werewolf develops a fascination with humans. After a year or two of skulking and scavenging around a human village, watching and listening in on them to learn their ways, it takes human form, wears (stolen) clothes, and tries to befriend the humans. After a few false starts, he gains their favor, and is able to make a good living as a liaison brokering deals between the human villagers and the local packs. For the remainder of his life he lives mostly as a man amongst the humans, acting more human with each year. Eventually he builds a house, takes a human wife, and has a human, non-shifter child. This child is an entirely normal non-werewwolf human, whose father was a werewolf, and who's paternal grandparents were actual regular-ass wolves.

There is also some degree of cultural cross-pollination as well. For example, some wolves have abandoned the forests and hunting to herd livestock in the highlands, on their own, without direct human involvement.

First, is this coherent, interesting, and sane from a world-building and storytelling perspective?

Second, what sort of other weird/interesting/horrifying implications are there? The fact that normal, domesticated dog's don't exist has loads of implications, for one thing. The fact that humans exist right next to another sentient (if somewhat alien) species has others, in the way ie land-mannagement works. I mentioned 'cultural' effects that the interplay had on the wolves, what sort of effect would it have on human culture?

Also, keep in mind that this is a horror-ish setting, so feel free to include any fridge horror repercussions you come up with.