I found this explanation on eviction notices: It could be a 3 day Waste, Nuisance or illegal activity notice or a Pay or Vacate notice. But this is for Washington state, other states can vary I guess. The 3 day illegal activity is meant for serious stuff. Like they want you and your meth lab out. They are kind of like a warning though and don't mean you have to move out in 3 days. Just shape up or be prepared to be forced to ship out. Exceptr the illegal activity sounds like they can get you out faster, hopefully.http://www.tenantsunion.org/en/rights/eviction-process
I agree it sounds like there is more to the story. Especially if pets are allowed. Eviction and a lawsuit is pretty harsh to go to right away. I would think there is some type of history or something is not being done like paying a pet fee or barking or something.
Maybe there will be more news at some point.