При кучета, robenacoxib показва приблизително 140 пъти по- висока селективност спрямо COX - 2 (IC50 0, 04 µM) в сравнение с COX- 1 (IC50 7, 9 µM).
15 In dogs, robenacoxib was in vitro approximately 140 fold selective for COX-2 (IC50 0.04 µM) as compared to COX-1 (IC50 7.9 µM).