In a medium microwaveable bowl, microwave the peanut butter for about 10 seconds to soften. Whisk in the tamari, orange juice and ginger; stir in a splash of hot water if the sauce begins to tighten up.
Stir the carrots into the dressing and toss. For your pooch, pack a picnic-size portion and label it.
For the people's portions, scatter the scallions and peanuts on the remaining salad; season to taste with salt and pepper.