i was thinking that once your creatu hits age 100 it asks you would you like to change your pets appearance to grand. this will be a yes or no question. if you say no your pet remains an adult but if you say yes your creatu has a 50 percent chance of turning into a grand creatu and a 50 percent chance of going back to age 0. CS pets dont turn grand however seasonals, double seasonals, and normals do. The grand look will make the creatu look more bold, cute, fierce, or awesome. Depends on the pet.