Q&A: Coping with stable aggression

horse-stable-bars.jpg
Horse with ears back behind bars
(Image credit: Jem Newton)

Q: I keep my 15.1hh 11-year-old British Warmblood gelding at a riding school on part livery.

He is very aggressive towards anyone who enters his stable or goes near him and he objects to being groomed, especially with a dandy brush. He has to wear a muzzle to stop him biting me when I groom him and there are bars on the stable door to stop him biting passers-by.