Mrs. Van Daan. Mr. Frank said they'd be here at seven o'clock. He said . . . Mr. Van Daan. They have two miles to walk. You can't expect . . .

Mrs. Van Daan. They've been picked up. That's what's happened. They've been taken . . .

Mrs. Van Daan is worried that the Franks have not yet arrived because she believes

they may have been captured and sent away.
they may have been discovered by their neighbors.
they may not have been able to make the long walk.
they may not know where the hiding place is.

I'm not going to write 150 words lol, but i will you with giving you examples of how they kept the animal population from revolting. napoleon made a list of rules, and told everyone how "important they are even though he was known to break them and then have them changed by the only animal who could read on the farm. none of the animals were intelligent enough to read, so they never knew if they had been changed or not which was an advantage to napoleon. napoleon constantly reminded them that if they revolted they would have to go back to mr. jones' way of things, which in retrospect was "worse" (wasn't really worse though, he was just saying that to intimidate since he didn't wanna lose his power). one of the main reasons they revolted in the first place was food, and of course if they revolt napoleon will not share food with them.

Animal control is the right answer