No statistically significant difference (P = 0.805) was detected in the median (range) HbA0 and HbA2 between the reference population [100% (98.9–100%) and 0% (0–1.1%), respectively] and dogs with non-regenerative [100% (98.9–100%) and 0% (0–1.1%), respectively] or regenerative anemia [100% (99.0–100%) and 0% (0–1.0%), respectively] (Fig 2). Here, HBA2 is linked to anemia (phenotype).