I keep Aniprin (aspirin powder) and DMSO on hand and fresh at all times. Most things I can treat with that. If there is swelling or pain I figure aspirin is what I would take myself. DMSO is great for some quick heat when needed. The main thing is to keep all meds fresh. Don't give your horse some medicine that's been on the shelf for a year or 2
I very rarely run into something I need bute for.