Do wolves do it though? Seems far more likely that, like many other dog traits, this is something that was artificially selected by humans as being cute.
Probably the people who spent months setting up an experiment to explain the behavior didn't consider this notion that occurred to the dilettantes thinking about it for 30 seconds.
I came here to ask the same question. I'd like to ask the researchers if they were able to study that. A quick google search shows not only do wolves cock their heads but other canides like foxes and coyotes do, too.
