how do pet scores work?

[Bignasty]

I've got 744 pets all rare and max level yet if I look at the world rankings for example, there are people with the same amount of pets as me, but they have 2 points more than I do. where am I missing points? and what do I have to do to get them?

[Jerebear]

If two of the pets you own are the argent squire and guild page which cannot be max level and they don't have those two but have two other pets that can be max level, then they will have 2 more points (1 point per max level pet).

You can see this if you do a collection compare between Nasty (your WCP account?) and Arbult and have it show "only if in one collection" for example.