Thundercrack! Curt McDowell, 1975.
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Edition screened: Synapse Blu-ray, released 2015. English language. Runtime approximately 160 minutes.
Summary: No particular depictions of violence or harm to animals. Bestiality is mentioned, but the act is comedically play acted by someone dressed in a gorilla suit. 3.5/5❤
The Synapse release also includes a DVD of bonus material including the excellent feature documentary It Came from Kuchar and five short films by McDowell, all free of animal violence:
Confessions (1972)
Naughty Words (1974)
Loads (1985)
Boggy Depot (1973)
The Siamese Twin Pinheads (1972)