Originally Posted by toto
If she's got a dorsal stripe she's a dun-- I looked through the pedigree for a dun and found that sun mac miss' dam is a dun 'Sun maid' theres definitely dun factor in her blood..
The black tobiano is just sun bleached.
Re the italicised. A dorsal stripe does not automatically mean the horse is dun. Countershading and grey can both cause very clear dorsal stripes with no dun present.