Is it normal for dogs not to protect their food?

It is normal. This is related to the dog's personality and the living environment of his childhood. It is also related to the variety.

Dogs that grow up in dog factories have serious eating habits.

Most tame dogs, such as golden retrievers, don't protect their food. Alaska, a wild dog, mainly protects food.

I think dogs that don't protect their food are the healthiest and most pleasing.

So your dog is normal and healthy, don't worry.