Pet Sematary/Headscratchers

If you live that close to a road that gets so much truck traffic, and you have small kids, wouldn't it behoove you to build a fence around your front yard?
If you have to bury your own, then how was the bully revived if no other family members were present?
- Because Gus clearly belonged to... whatever it is that dwelled in the Cemetery.
- It could just be a saying, and not an actual "rule".

So what happened to Ellie?
- She grew up and died.
  - It's indicated in the book that she was well on her way to going completely insane.