I am curious about caslicks...I have a mare that has been successfully bred (pasture) and successfully foaled twice. She was just AI'd and the stallion owner suggested she gets a caslick if the 18 day ultrasound shows her to be in foal. He says this is due to her "shelf"....which is there, but not extreme. She has always come back with a clean culture, so there isn't any indication of her contaminating herself. Never had any vaginal infections. I am not for unnecessary procedures and would like some other opinions on this. I have also read that once a caslick, always a caslick. Is this true?