From a bit of research, it seems that hollyhock is no more toxic to dogs than a host of other plants we grow - some are far more toxic, in fact. Its fair to assume that, if your dog chews and consumes a fair bit of hollyhock, he will be sick, probably quite a lot, but once the vomiting is over, that's it, no more problem.

Thanks Bamboo

ive found having dogs all my life they seam to know the differance between grass and even plants that look like grass unless there puppies so i wouldnt worry to much .