Mix the carrots, celery, cilantro, jalapeño (or fresh chili), peanuts, scallion, and chicken in a medium-size bowl. Note: these items can be prepped the night before and stored in the refrigerator.
In a small mason jar, add together the fish sauce, fresh lime juice, salt and pepper, sugar, and canola oil. NOTE: Dressing can also be made ahead and stored in the refrigerator.
When ready to serve, shake the contents of the mason jar and pour over the Thai Celery dish. Toss well and enjoy.