Hi everyone! I just bred my outstanding mare 3 weeks ago and next week I'm going to get a vet check to see if she is in foal. My mother inlaw has a very Mareish mare that has become very very protective of my mare. She won't leave her side and when they are in pasture together she won't let any other horse near her and even try's to keep her away from me, which can become scary! Just want to get your thoughts on why all of a sudden why she's become so protective. Thanks for the replies in advance!
( if my mare is in foal, the baby will have a forever home in our barn)