i am a total noob.i just recently got maya 7.i downloaded the video on here to make the cartoon dog.in the first part of the video about 5 min through the guy is shaping the dogs head.he shapes the sphere into the shape of the dogs head.when i try to shape the head it never works like the video.only a small triangle shape gets pulled from the sphere.when he does it one side of the whole sphere moves and is rounded. kinda hard to explain.any help?