Dog-on-dog aggression related to fear can be generalized or specific to situations. It usually involves more-generalized aggression to all dogs or dogs of a certain breed or size. The dog’s history may be important (for example, aversive events may have occurred in the dog’s life).
Posturing may be a clue, as for example if the dog backs off with its tails tucked. Many of these dogs respond well to the combination of behavior modification and pharmacological intervention (anti-anxiety medication).
**Aggression categories compiled from:
Clinical Behavioral Medicine for Small Animals, Karen L. Overall, M.A., V.M.D., Ph.D. Diplomate, American College of Veterinary Behavior, Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia. Pennsylvania, Mosby, Inc. 1997
The Dog Who Loved Too Much: Tales, Treatments, and the Psychology of Dogs, Dr. Nicolas Dodman, BVMS, MRCVS, Bantom Books, 1997