The Plymouth Police Department has good news to report: Big John the horse is on the mend.

The past few months have been tough for Big John, a seven-year-old Clydesdale-Belgian cross that was diagnosed with a rare autoimmune disorder.

The Plymouth Police Horses Foundation set up a GoFundMe page to raise money to cover the costs of his treatment and recovery. As of Tuesday, it had raised $2,760.

“He’s doing great,’’ said Sergeant Ray Reid, commander of the Police Department’s mounted unit. “He’s getting better and better every day.’’

He said Big John joined the mounted unit in May and began patrols in July, and over the summer developed swelling around his hooves. At first, his veterinarian thought it was a common, treatable fungus, Reid said, but the treatment didn’t seem to work.

“It just kept getting worse,’’ he said.

After several visits to veterinarians and specialists, police discovered that the horse was suffering from a skin disease called equine pemphigus foliaceus.?

“It’s an autoimmune disorder that attacks his feet,’’ said Reid. “Basically, his body rejects his hooves.’’

Today Big John is recovering at a horse farm in Carver, and the steroid treatment and supplements he’s taking appear to be working, Reid said. If all goes according to plan, Big John could be back on the road in the spring.

“He’s starting to heal,’’ said Reid. “He was always one of our best horses; it was a shame that he got this. He has a gentle nature about him. Kids and people love being around him. I’m so happy he’s getting better.’’

For more information on Big John, visit www.gofundme.com/xm6p4yj9.

Emily Sweeney can be reached at esweeney@globe.com. Follow her on Twitter @emilysweeney.