[JuanRamos]

First thing that came up when I googled the image was this article in Snopes:

snopes.com: Heliotrope Warning

According to this the plant only causes liver failure to horses, so I dunno if the same symptoms could show up in a dog. IIRC there are plants deadly to cats but not dogs, and vice versa.

The ASPCA's Animal Poison Control Center article on heliotropes lists them as a substance which is toxic to horses and can induce liver failure in equines:
Read more at http://www.snopes.com/critters/crusa...dbSjZjqfuGJ.99