Rice pudding, as the name suggests, contains high amounts of sugar; this is generally not a good component for a dog, especially for those already with diabetes or some obesity-related problem.
Even for healthy dogs, giving them rice pudding wouldn’t be a good idea as it could introduce them to the issues above if they eat it. Diarrhea is another side effect they could experience after consuming the rice pudding.
Can dogs eat rice pudding? No, it would be best if you tried to keep the pudding away from your dog’s reach as much as possible.