I used to think a big buck could defend itself well, till yrs ago this video came out of trail cam time lapsed pic's,
it showed a healthy mature buck getting attacked and killed and eaten by coyotes, and they ainb't that big of coyotes either here, and buck is well, pretty good sized compared to them
issue is simply, a DOG, coyote can out run a deer to the point it ain;t got nothing left, which is why its legal to shoot dogs chasing deer in so many states!
its a pretty sad video IMO
and very cool at the same time,
and have ti imagine rare to get all on camera like they did,
so never say never!
and again I wish that buck the best to live long and age well, and you get a chance at him come hunting season!