Deer Living on the Porch...

We have a small herd of deer who have taken up residence on the porch at Dog Days. They are eating the shrubbery while relaxing out of the snow. I thought Ewe bushes were quite poisonous (I even think that Ewe poison was used to kill victims on the Forensic TV show "Bones" if I remember correctly), but the deer do not seem to mind and the shrubs are almost completely denuded of their foliage. Wonder if like some insects who eat poisonous plants in order to use the poisonous compounds to protect themselves from predators, the deer will become inedible too? Might not want to eat Dog Days Deer, they pack a punch!