Exhibiting low activity levels

Change to eating habits, often eating substantially less

An increase in amount of time spent sleeping

Showing signs of anxiety or aggression through sporadic howling or whining

Excessive licking, especially to their paws

Flattening of the ears

Less interaction with other dogs

Regression in house and behavioural training

Bored or frustrated

Barking more or being hyperactive

Loss of interest in the things they once enjoyed