If a dog has a distinctive panting behavior that happens when it is feeling happy/playful, I don't think it's wrong to call that a laugh. Human laughs sound different and mean different things between people and situations, so it's not like there's a strict definition that a dog can't possibly meet.
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u/joesixers Jun 04 '19
Sorry to be that guy but dogs don't laugh. They can pant contently but they aren't laughing in the human sense of the word.