FURVERT!

4:3 animal_genitalia animal_penis anus backsack balls black_body black_fur blue_eyes butt canid canine canine_genitalia canine_penis canis dark_anus digitigrade domestic_dog erection feet feral fluffy fluffy_tail fur genitals german_shepherd grin herding_dog hindpaw knot looking_at_viewer male male_feral mammal pastoral_dog pawpads paws penis perineum presenting presenting_hindquarters quadruped raised_tail skyl4378 smile solo tail tail_anus teeth upside_down_penis vein veiny_penis