Cooper at one point says to Ryan when directing him to sit down and not do anything, "You — sit. Stay." Do these commands sound a lot like addressing a dog? They foreshadow Ryan turning into a werewolf. Furthermore, when Ryan transforms, the first thing anyone says is, "Bad dog!"
Notice how Terry very obviously turns towards Ryan right before he throws up. Ryan had a gun pointed at the dog, and Terry deliberately vomits on him to stop him from shooting it. That way, Ryan's anger would be redirected at Terry rather than Sam. Terry is also very unapologetic afterwards, suggesting it was deliberate.
The stew in the cottage that the soldiers eat is described as tasting like pork. Towards the end of the film, the corpse-filled cellar seems disturbingly like a meat larder, and real-life cannibals have commonly reported that human meat tastes like pork. This works two ways: it reveals the werewolf family when in human form were not only hiding their victims' bodies around their house but were also cooking and eating them, and it indicates the soldiers were unknowingly eating human stew.
Not to mention when they start eating it, Megan says "you can't just help yourselves...", which seems like her being oddly concerned with manners on the first watch. But on the second, you know she was trying to stop them unknowingly eating human flesh.
There are six members of the Uath family in total, including Megan. Towards the climax, only three werewolves including a transformed Megan are in the kitchen when Wells blows the cottage up. Where are the other three at the end of the film? Are they still alive in the woods?
Megan might have claimed the Uath family were good and kind people in human form, but she isn't the most reliable source in the film. Since it later turns out the family keep their victims' skeletons hidden around their house and keep their fresh kills in the basement and likely even cook said kills for food, just what was it really like for Megan to live with this family against her will as one of them for nearly two years?
There's only one farm in that entire glen because the Uath family probably wiped out everyone who lived nearby. The nearest town or population center is well over an hour away, meaning this is a massive amount of land that's just not being used. There's a good chance that the families presence in the region is utterly unknown to the local government. After all, it's hard to maintain your werewolf cover if you have neighbors or police that know where you live.
