Poor old Dorothy, the Giant Tortoise, has a Desert Thorn stuck in her. If you don't want to bother with the Desert Thorn, but you need a pointy object, you can get the Pointy Knife instead.

Dorothy doesn't want you to come near her.

Firstly, stand next to Wrangler and observe Dorothy for a bit.

Dorothy is snoozing. She can't worry about you if she can't see you ...

Only walk closer to Dorothy when her eyes are closed. If she opens them while you are walking, she'll disappear into her shell. If she has her eyes open, you need to be absolutely still. She'll close them eventually, then you can proceed. If you need to reset her, walk back next to Wrangler.

The Desert Thorn only half came out of Dorothy. She flipped out and banged on the ground. A crack has opened up, in the ground.