Figure 6. Number of case and control dogs who received dietary supplements.

Case dogs have TC_index≥2 whereas control dogs have never chased tail tails (TC_index = 0 ). Dietary supplements are divided into the following categories: vitamins, minerals, Omega-3 and -6 fatty acids, and “something else”. All breeds are pooled for the analysis (n = 116). Statistical significance is marked as following *<0.05, **<0.01, ***<0.001.