No dogs seen but in minute 9:19 thru 9:26 on Hulu you hear a dog barking very very very faintly in the distance during the night scene. If you have subtitles you'll see it mention "dog barking". Then it says " dog yelping". :( So unsure if meant to be implied that the dog was killed because the creatures were landing. I had my soundbar on very loud but I couldn't hear it but only saw this cuz of the caption states it happening. Maybe with headphones it can be heard but just wanted to note it for those who are triggered by dog deaths not seen but with sound. Again very implied but the CC captions are there.
The main characters mother died before the film begins leaving her in to live in her house all alone. She was presumably a teenager when this happened.
Yes and no, they show multiple close ups of the alien creature inside the throat and underneath the skin. They also show the girl dig into her throat to rip a creature out.
You could say the little houses and miniatures are for both adults and children. They are toy similar. They are thrown around and one is even used as a weapon.
At the very end the lead character appears to stare directly at the camera making a sweeping, seemingly inviting gesture. The fourth wall is not verbally broken but the body language strongly appears to be directed at the viewer. Especially in context it could be seen as very creepy.