Shrubs and horses

[Begadoc]

We have planted a shrub garden at the local church - a place of contemplation for people who have lost children. Adjacent to the fence bordering is a field used by horses. Unfortunately they lean over and eat the Escallonia I am trying to establish as a hedge. They leave the rambling rose alone and also the hollies, but these plants are not too visitor friendly being adjacent to the path.

Any suggestions for suitable horse resistant shrubs and UK weather?

[Frank]

Not horses, but deer around here don't eat my butterfly bushes or hollies. Suspect they would keep away from things with thorns like pyracantha. Deer will eat evergreens only when there is a lot of snow and I doubt if horses would get that hungry.