Bobby, a 12-year-old rescue pony, was found on Thursday evening with his stomach slashed and his bottom lip, ear and genitals cut off. His mane had also been cut off.
It is thought his attackers may have targeted him because twisted feet and breathing problems meant he couldn’t run fast.
Owner Wendy Redpath, who has had Bobby for four years after finding him on a specialist re-homing site, branded whoever carried out the attack as “pure evil”.