In a random attack, a Sussex rescue mule was stabbed in its face.BBC reports that the animal only just came to trust humans after being neglected for 20 years.For more stories, visit Insider's homepage.Tommy, an old rescue mule from the Undercliff Pony Rescue, Rye, England was attacked randomly on Monday.BBC reports that the twenty-year old mule, who was rescued after suffering years of neglect and abuse, had been at the center for two year.Sharon Baker, the owner of the rescue clinic, said that Tommy suffered a hole in one cheek and had lost several teeth.BBC spokeswoman, She said that while we can heal the wounds, it's the mental scars which will take time.She said, "This person must be caught and brought before the courts."The incident is being investigated by local police. A resident offered a reward of 1,000 dollars ($1,386.70), in exchange for information leading towards the arrest of the attacker.Baker stated that Tommy had "zero trust in humans" when he was brought to the rescue hospital. "It's only the past six months that he has actually allowed you touch him."Tommy began accepting carrots from passers-by in the last six months. This shows a promising level trust. Baker believes that someone has abused this trust.She said that someone had lured him to the fence, and thought it would be fun to stab him in his face."Although it's not clear what caused the attack, the rescue center raised funds to pay Tommy's treatment as well as to install CCTV cameras at the scene.Insider has the original article.