Pets are all glitched in Sims 3, need help!

I know that there are so much questions related to this topic, but just there is one thing I don't get, how come if I use Swift Shader 3.0 my pets look great and the game says it didn't find any graphics card and that all settings are on as high as they can be and when I remove the Swift Shader the game is normal but the pets are all glitchy again. Help!? So want them to be normal but without slowing the game down... 😕mileysad: