Adult kibble is larger and can pose a choking hazard for puppies. Dogs' jaw strength and kibble size preferences vary based on their breed and size. Picking the appropriate size helps avert potential safety issues during mealtime. Adult kibble is larger and can pose a choking hazard for puppies. Dogs' jaw strength and kibble size preferences vary based on their breed and size. Picking the appropriate size helps avert potential safety issues during mealtime.