I am battling the cow issue here too! There are cattle behind my property which are on a rotational grazing system so they are not always present, which has made it harder for my mare to get used to them. She has started to bolt a couple of times when driving by. Their land is elevated above ours and when they gather at the fence line they do look huge! I walked her out there just on the lead a couple of weeks ago because the neighbor had just moved them on her quad and Annie spooked and tried to run so we circled around and around and I got her to stand and relax there near them for about 10 mins. If they were there regularly we'd probably be able to get over this sooner. Thankfully gelding could care less about the cows. He has another issue now which I'll share in another post.