Someone told me that if I add parsley to my girls food it will help dry up her milk supply after weaning the pups.
Has anyone ever heard of this?

No, but here are some links to check out.

http://www.google.com/search?hl=en&ei=wP_hSt6JNNWtlAei8JSKBw&sa=X&oi=spell&resnum=0&ct=result&cd=1&ved=0CAwQBSgA&q=parsley+to+dry+up+milk+supply+in+a+dog&spell=1

Thank you for the link.
Seems it does help.
Very interesting!