Animals 1 Carrageenan, Formalin, Arthritis 1 Choice Behavior 1 Contingency reversal 1 Discrimination (Psychology) 1 Dogs 1 Female 1 Food 1 Gender studies, gender groups 1 Heartworm 1 Immunodiagnostics 1 Indomethacin 1 Inflammatory pain 1 Male 1 Pets 1 Real-time PCR 1 Reverse-reward contingency 1 Reward 1 Vector-borne disease 1 Visual discrimination 1 Wildlife reservoir 1 animal 1 cyclooxygenase enzyme 2 1 decision making 1 dog 1 female 1 food 1 interleukin-6 1 male 1 nitric oxide 1