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2023 2d_animation 4:3 animated animated_gif anthro canid canine canis collar collar_only collar_tag digital_media_(artwork)duo featureless_crotch frame_by_frame fur growth hair human human_to_anthro humanoid kissing linear_sequence male male/male mammal nude potvoheu2 sequence short_playtime simple_background smile species_transformation tail tail_growth transformation transformation_sequence wolf