“What they’re doing on the boat is not clear”
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Spanish conquistadors/explorers that came to the Americas had pigs on their ships as a food source. Some escaped, became feral and rapidly reproduced.
Since the dingoes were on boats from SE Asia, I’d guess they were also the people’s food source. Some escaped and became wild.
Bigfoot has domesticated Hell Hounds too—so they say on Mountain Monster Hunters.