part of signs are definitely intuition; i also got negative vibes from it. for me if i find something natural that feels like a sign, i consult the internet to see what other folks and find what resonates with me. (beware culturally appropriative websites; for example, don’t get a lick of info off a website talking about spirit animals as anything besides a closed american indigenous practice!)
if you want my two cents, i don’t have a solid feeling about what the actual animal aspect of it means, but it being beheaded could be a literal reference to a disconnect between your head (cognition, intuition) and something else in your life. there could be ways your intuition and the world around you clash; you could even be clashing with yourself. it could be a warning to trust yourself.