The tail is upright, although it may be wagging. A dog in this stance is ready to attack. This is the posture dogs assume when playing with family members or other dogs. Humans often misinterpret this as aggressive behavior because this behavior never occurs when dogs greet other dogs. A dog may bark in this invitation to play, but it does not growl excessivly.
Ears are drawn back, tail is tucked tightly under body.
Some submissive dogs assume the most vulnerable position known to dogs, lying on the backs, exposing their undersides. Many dogs are used for hunting purposes, whether it is an animal hunt or a man hunt. Dogs are used to find drugs, for their keen sense of smell can detect minute quantities or well-hidden contraband. References American Kennel Club. The Complete Dog Book.