I'd go for an expansion pack, since they usualy tend to add more variation to your game. Also you get to pick one of your favourite flavour :)
rosehill college
Pets is an expansion pack.
AOE 1 and its expansion pack AOE 2 and its expansion pack AOE 3 I'm not sure if it has an expansion pack
The Nightlife expansion pack.
The first expansion pack released was University.
No, You Can't you have to use the expansion pack disc
you need the pet expansion pack
no, the ocarina of time does not need the expansion pack.
To add an expansion pack simply install the disk the same you would the original.
As of now, there is only one galactic adventures expansion pack.
there is no pet shop saddly, they should make an expansion pack for it
by buying the expansion pack which should be released this November