I was raised around horses and though I am a tad rusty on some of the horse lingo, I believe Open means they are ready to be bred. If it was just the fact she was pregnant and they admitted that maybe she accidentally bred, then I wouldn't put fault on them. But because they chose not to release the name of the stallion, nor did they try to work with you I would defiantly be mad. They were rude and unprofessional and I wouldn't not recommend them to anyone else. IMO