Distribution of the dogs according to severity of tail chasing behavior.
Only individuals that exhibit tail chasing behavior are included. Severity is described by the TCindex, which is a sum of two questions “Does your dog chase its tail?”(scale 0–6) and “On average, how much time on a normal day does the dog spent in chasing its tail? “(scale 0–6). (BT = Bull Terrier, standard, MBT = Bull Terrier, miniature, GS = German Shepherd, SBT = Staffordshire Bull Terrier).