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anthro backsack ball_gag balls bdsm big_muscles body_hair bondage bound breve butt butt_slap canid canine canis dalmatian domestic_dog dominant dominant_male duo erection gag gagged genitals german_shepherd halex happy_trail harness herding_dog inside knot leather male male/male mammal muscular muscular_male nude paddle pastoral_dog penis raised_tail reddened_butt rrowdybeast slap spanking submissive submissive_male tail