Under normal circumstances, poodles eating rice will not have any impact on their life span and can live for a long time. However, eating only rice can easily lead to malnutrition in dogs, so it is best not to feed your dog just rice. You can usually add some chicken, beef, carrots, broccoli and other foods to the rice, so that the dog will like to eat it more and the nutrition can be more balanced. You can also replace the rice with millet.