Anyone know what kind of plant this is in the photos?  My dog keeps eating the leaves, and it makes him sick.

[![enter image description here][1]][1]


[![enter image description here][2]][2]


[![enter image description here][3]][3]


  [1]: https://i.sstatic.net/wYsbR.jpg
  [2]: https://i.sstatic.net/MByjH.jpg
  [3]: https://i.sstatic.net/QrWqS.jpg