Firstly, fear aggression may be shown if a dog is unfamiliar with people or other dogs. Figures 2 and 3 suggest that the referral rate of fear aggression towards other dogs has steadily increased over the years. Aggression between dogs living in the same household is usually about social status. This can also result in the performance of defensive aggression from the lower-ranking dog. Figures 2 and 3 show the referral rate of aggression between dogs living in the same household since 1996.
Separation anxiety is a condition that affects dogs who are over-attached to their owners.
Dogs suffering from separation anxiety become extremely anxious and distressed when they are separated from their owners. Figures 2 and 3 show the referral rate of separation anxiety since 1996. This drop was probably due to the fact that some members were actively seeking the referral of separation problems due to anxiety, for clinical research in 1996. In each year, the referral rate of separation anxiety was higher in dogs obtained from a rescue environment. Dogs obtained from other environments had the lowest referral rates of separation anxiety in each year.