These are the only 2 occupied lots that are safe to put into your hood because these are made by EA for the Pets Expansion, any other occupied lots are bad to use and will cause corruption.
From the wiki and from my own game.
Kat family.
http://sims.wikia.com/wiki/Kat_family The Kat family from The Sims 2: Pets can only be placed once in the game, unlike other family bin families which can be added for each neighborhood.
Kim family from the wiki and my own game.
http://sims.wikia.com/wiki/Kim_familyThe Kim family can only be placed once in the game, unlike other family bin families which can be added for each neighborhood.
These 2 family's are safe to put in your game and you can only do it once unless you follow this guide to be able to place more.
http://sims.wikia.com/wiki/Game_guide:Re-adding_Kim_and_Kat_families