[header] How to rescue an abused horse [title] Make an appointment with an equine vet for the abused horse. [step] An abused horse may have suffered physical abuse or neglect. Both leave scars in their own way. 
First off, get the horse examined by an equine vet. You will need to know the extent of any physical damage that has been done to the horse, and should have a frank discussion about the long term and ongoing cost of medication, should that be required.