Also please help me with the other required pet related prerequisties (like vaccinations history, behavioral aspects etc.) that landlord needs to be make sure while screening tenant with pets.

Gave them a warning that that behavior will not be tolerated. 

The use of drop down menus is impossible as there's no 'mouse' to position over the menu root (called a Mouse-Over or Hover behavior). 

If the doctor would not confirm, then I would not rent to them.If I could not deny, I would make sure my animal policy addresses issues such as cleanup, shots, flea control and behavior of the animal. 

I'll spend some extra money just to make sure they aren't encourage by their behavior, but not too much.

When things started going wrong, they probably panicked and hence the fraudulent behavior.

Won't improve the heating bill much but will make the residents feel warmer.I would say getting a 3rd party to install submeters will be more effective at effecting peoples behavior than proportional metering but if submetering each unit is too hard maybe submeter by floor and pit them against each other.

It's a lot easier to make a phone call and remind someone that the rent is due then it is to pay a process server to serve some kind of a notice.This Behavior suggest to me the landlord wants you to move out and is trying to play games.

How can we make contracts anonymous to limit this behavior?

This is very common behavior for tenants when they first move into a property without meeting the owner first, but they know the owner is close by enough to show face.