So we have two dogs and two horses.
My beautiful mustang mare Sahale still isn't trustable on the same side of the fence with our big dog Kuruk. I have let them interact through the fence for months, and also with the horses tied/ dog on a leash. Both our horses are fine with Jade our little heeler/border mix, and our filly Koosah is friendly and trustable loose around both dogs, but my mare Sahale just doesn't like Kuruk. He is happy and animated, but doesn't bark or chase or do anything to warrant Sahale's hate. Although the horse rescue told us Sahale was bit by a dog in a previous home, she was fine loose with the few dogs that lived at the rescue. When Kuruk comes up to her she pins her ears, head tosses, snakes after him, and sometimes tries to reach him to bite.
Starting next spring when our filly is old enough to ride we are going to trail ride and camp with both dogs (off leash) while we are riding both horses, but I need to trust Sahale won't stomp my baby boy first. Any advise would be appreciated!!!! Thanks!