I recently purchased some property with hay field. A strange plant popped up a few weeks ago. We tried and possibly identified it as Curly Dock, witch seems to be poisonous to horses.

But also as Dooryard Dock, which nothing is said about. I have a large book of poisonous plants and there is nothing about any type of dock. I read some topics on other horse forum and everybody says the horses don't eat it, they pick it out, etc. No worry about poisoning. I have removed most of it, but wanted an opinion where I could communicate back. Just curious on other people's experience with the weed.