animal_genitaliaanimal_penisanthroanthro_on_anthroballsbrown_ballscanidcaninecanine_genitaliacanine_peniscanisclawsdigitigradedomestic_dogduoerectionfinger_clawsgenitalsgerman_shepherdgropehappyhappy_sexherding_dogholding_another's_knotholding_another's_penisholding_knotholding_penishybridknotknot_grabmalemale/malemammalmastiffmisterstallionmolossermuscularmuscular_malemustelidnudenude_anthronude_maleotterpastoral_dogpenispenis_grabpink_knotpink_penisrottweilersexsmilestandingsurprisedtoe_claws