hairy vetch / the plant/ not the seed
You had replied that the seeds of hairy vetch are toxic for dogs but what if they eat the long grassy part?
Is the plant part toxic ?
Macomb County Michigan
The studies were done for grazing animals like horses and cattle. The studies I have found list it as a poison to horses and cattle and that the cases reported our infrequent even in grazing animals. http://wric.ucdavis.edu/PDFs/plants%20reported%20to%20be%20poisonous%20to%20animals.pdf
Cornell University lists the seed as the poisonous part of the plant: http://poisonousplants.ansci.cornell.edu/php/plants.php?action=indiv&byname=common&keynum=91