There are tears on my pet dog. My friend asked me to change it into royal dog food, saying it is healthy food. Tell me if I have fed it.

The dog's tears may be caused by excessive salt intake. The salt content of royal dog food is really low. My dog has been eating royal dog food since he was a child. Now he is over two years old and has no tears. But I don't know if royal dog food is useful for dogs that have already had tears. This is just my personal experience and is for reference only.