01-14-2012, 09:49 AM
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I also suspect he is doing it himself. It is so common. There are many reasons a horse will rub.
Worms. Make sure he is on a regular worming schedul rotating the wormers. There are anal worms that come out at night and cause itching. You will not see them during daylight hours.
Parasites. There are mites that are very hard to see that irritate the horse. A miticide shampoo may help.
Allergies. Many horses have allergies to many substances. A student of mine has a fabulous pony that kept rubbing ALL the hair off the dock despite treating both of the above problems. They ended up doing allergy tests and found he was VERY allergic to thirty different substances...including several grasses common in hays. He is getting allergy shots in the hope of helping this problem.