Yes it's true - it is a sign of respect and submission, and is completely appropriate behavior when approaching a person, a child, or another dog. Does not neccessarily mean that you have a submissive dog, but a respectful, confident dog, since his ears are up normally.
Gryffon Vom Wildhaus
BH, OB1, TR1, AD
Rottweiler/Hairy Dog mix?? 2004-2015