Tudo Por um Cavalo (1988)

Dark-haired girl crawling in a backyard while a dog laps at food right next to her. She’s on all fours, wearing nothing, and the dog starts licking her ass — not fake, this is real zoofilia. Later, she’s on a bed indoors, lying back as the dog mounts her from behind. You see the full penetration, slow and deep, her face relaxed like she’s used to it. Another scene cuts to a guy doggy-fucking a blonde girl in the same room, then two women go at it on the floor — one giving the other a lazy, open-mouthed blowjob. Camera stays tight, no weird filters, just straight raw footage of nasty shit going down.