| Behavior | Possible Medical Cause | |----------|------------------------| | Sudden aggression | Pain, brain tumor, hyperthyroidism, rage syndrome (rare) | | Pica (eating non-food) | Anemia, GI disease, hepatic encephalopathy, nutritional deficiency | | Excessive grooming (cats) | Skin disease, psychogenic alopecia, hyperesthesia syndrome | | Compulsive circling | Forebrain lesion, vestibular disease | | Howling (senior dogs) | Canine cognitive dysfunction, deafness, pain |