Not sure if this applies to The Sims 3: Pets in all of South America or just Brazil, but The Sims 3: Pets will be rated for teens 14 and older. This is big news because prior Sims 3 games were rated for teens 16+. Their new rating is now on par with the ESRB Teen rating of The Sims 3 games here in the States. Brazilian Simmers rejoice!
Source: Sims Domination