A tan male American staffy and female brindle bull mastiff are being hunted by City of Kalgoorlie-Boulder rangers after the attack.
Pep, a 15-year-old horse, suffered deep wounds to his front leg, head, neck and hindquarters.
The incident occurred at the Goldfields Equestrian Centre on Marshall Street, just an hour before about 20 children took part in a monthly pony rally. Tammy Pagel, Pep’s owner, rushed to the centre when she heard about the attack.
“I got a call saying I had to get down there right away because he had been attacked and I just couldn’t believe it,” she said.
“When I got there, Pep was in shock, he was shaking.
“They had him wrapped in a blanket but when he turned to look at me I saw the wounds on his face – it was horrible.
“They managed to calm him down and we called the vet and they started stitching him up.”