"Yogurt is a good source of available calcium and protein. When choosing yogurt, pick one that has live active bacteria and no sugars or artificial sweeteners. The active bacteria may act as probiotics. If your pooch is pudgy, make sure that you pick fat-free yogurt but not one that contains fat substitutes (e.g., Simplesse or Olestra). Frozen yogurt is a nice summer treat for dogs."
from 10 "people" Food for Dogs