It a dog but cows. From 41:00ish for about a minute there are awful shots of cows stuck in deep volcano mud. It’s one of the greatest films ever made apart from that. Also at about 65 mins there’s horses strut in mud
we see a lot of animals (horses, cows, donkeys, camels) used for transporting heavy loads and humans, sometimes struggling in water or mud, and animals abandoned on an island that will be killed by the eruption of the volcano. they're really a lot of animals in the doc (not always abused!) so be careful according to your sensibility
Also at about 65 mins there’s horses strut in mud