It isn't good to give your dog raw fish, white rice or other raw ingredients, as well as foods that are found in sushi like seaweed or avocado. Because your dog's stomach is very sensitive, even a small amount of veggies such as avocado could cause your dog to have a stomachache.
So, no. If you decide to give your dog a tasty treat, don't give him raw fish or any sushi, including California rolls. Don't even try to give it any! Among other reasons, excessively consuming avocados can cause your dog to vomit due to the toxins.