For the dressing, combine the vinegar, oil, garlic, Dijon mustard, salt, pepper and sugar in a jar with a tight-fitting lid. Shake to mix.
For the salad, combine the wild rice, stock and lemon juice in a saucepan. Bring to a boil; reduce the heat. Simmer, covered, for 1 hour or until tender; drain. Chop the chicken into bite-size pieces, discarding the skin and bones. Combine the dressing, rice, chicken, green onions and snow peas in a bowl 2 hours prior to serving and mix well. Chill, covered, in the refrigerator. Add the avocados and pecans just before serving and mix gently.
SERVES: 6 - 8