How to get different collars and fur patterns on the sims 2 pets for gamecube?

Question

where is the codes screen at? or someone please step by step? should i be at my house or a lot? im confused

i have the gnome and all the sites say:
Bonuses :
At the codes screen under the "Game Options" menu, enter one of the following codes to activate the corresponding cheat function:

Result Code

Collars
Black Dot Cats ZZZ11ZZZ9Q11Q91ZB1A or EEGJ2YRZQQ1IQ9QHA64
Black Dot Dogs ZZZ11ZZQHZ11Q91ZB1A or EEGJ2YRQZZ1IQ9QHA64
(ETC......)

Answer 1

I haven't played it, but google a FAQ or try hints on a large game site. You'll find out soon enough.