You have a little girl who wrestles with her dog..gets scratched even...secondary transfers throughout her own home..but no dog hairs on her bedding.
ALIENS abducted Danielle and did experiments. Similar to the cow experiments where they remove sex organs and the like.
They were going house to house with this transporter on their ship, and it kinda would vacuum up loose particles suspended in the air (like carpet fibers, hair, etc.) This cross-contaminated several houses in the area. They didn't take DW's son because he was watching Porno at the time, so they didn't consider his sex organs as 'virgin'.
DW was out at the bar while all this happened. Damon was asleep in front of the TV. The dog went crazy and tore up it's dog bed, mainly due to the high-frequency sound of the hovering UFO.
Of course the VD boys did see it but they were too scared to tell, and will have latent memories of it after they get much older.
Damon started to wake up, but the aliens hit him with the SOMBER RAY, sometimes known as the BUMMER RAY. This caused him to feel sleepy again, and when the pizza partiers came home later and woke him up, he wasn't really up to them staying long.
So they left, and since they were smoking dope, they all thought that the UFO they saw hovering above other houses in the neighborhood when they were coming back from the bar was probably due to the pot, they all decided to make up stories, as they didn't want to be known as TIN FOILERS, or UFO FREAKS.