Drain pineapple, reserving 1 tablespoon juice. In a medium bowl combine pineapple, carrot, apple, sunflower seeds, and raisins.
For dressing, in a small bowl stir together yogurt and peanut butter until smooth. Stir in reserved pineapple juice. Pour dressing over pineapple mixture; toss gently to mix. Cover and chill for 1 to 4 hours. Makes 6 side-dish servings.