Some of those kangaroos get pretty b*&%^y big too, especially the males, they absolutely bulge with muscle. I can imagine that would be a traumatic experience not
soon ever forgotten. Its not the first time I've heard of it though, particularly stories about kangaroos escaping to water when chased by dogs and then holding the dogs underwater...
and a blue heeler stirred it up suprise suprise

might be time for doggie obedience school/a leash!