Tail chasing is a behaviour exhibited in dogs that is characterized by spinning in tight circles in either direction, and can be slow and focused on the tail or fast and unfocused.[1] It is a compulsion similar to those seen in humans suffering from OCD[2][3] and it can be quite disruptive to the lives of the dogs themselves, as well as their owners.[4][5] Some causes have been suggested, including genetic factors,[6] and environmental factors that vary depending on the individual dog.[7][2] Furthermore, treatment options include drugs that decrease the frequency of tail chasing by targeting the underlying mechanisms, and behavioural changes regulated by the dog's owners.[4][5][8]
^Moon-Fanelli, Alice A.; Dodman, Nicholas H.; Famula, Thomas R.; Cottam, Nicole (2011-04-01). "Characteristics of compulsive tail chasing and associated risk factors in Bull Terriers". Journal of the American Veterinary Medical Association. 238 (7): 883–889. doi:10.2460/javma.238.7.883. PMID21453176. The present study provides detailed phenotypic and developmental information about tail chasing in dogs and illustrates some intriguing parallels with human obsessive-compulsive disorder and possibly autism.