OK this is something that worked pretty well with me. Have at least a stack (100) and a half (50) Rockarrots in your inventory. You need a taming pen, so like an open space surrounded by walls that the Equis can’t damage. I had metal, but anything else besides what it can damage is good. If yo have an Argentavis, you can use that to pick up the Equus and drop it into the pen. Mount, feed, dismount, standby. The first feeding, stay on until it eats again, then dismount and standby. After a couple seconds or maybe a few minutes, mount again and feed if it lets you. This worked for me for a level 115 Equus. For any clarification, my Instagram is _plump.tyb_ or for Twitter, it’s _plump_tyb_

Hope this helps 🤗