A large crest or fallen crest refers to a horse that has an overly large crest to it’s neck that may fall to one side in extreme cases.
Fallen crests are relatively uncommon, although any horse can develop an excessively large crest. It is usually seen in stallions, ponies, Morgans, and draft breeds.
It is usually from fat deposits above the nuchal ligament. An excessively large crest not only looks bad, but it puts more weight on the forehand. A horse with an excessive crest due to obesity needs a proper conditioning program.