As Linda said, it is normal because dogs are predators. It could be part of her breed as well. Our german short hair (bird dog) seems to prey on some animals more than others. Their stomach is perfectly capable of breaking down raw meat, beaks, feathers, etc. However, it can cause some gastrointestinal issues. If you notice he has ate something he is not supposed to, just keep an eye out for symptoms such as not eating, pooping black/blood or acting our of character.