Q: What is ringworm?
Ringworm is, in fact, not caused by a worm, instead, by a fungus that infects the roots of hairs. The hairs of the horse will generally fall out in tufts, producing small bare patches, which are commonly circular in shape (hence the name ‘ringworm’). The horse may have one or two bare patches, or multiple, depending on the severity and duration of the infection.
Ringworm is infectious to other horses, and to people, so the horse should be isolated to avoid physical contact with other horses, and the tack and grooming kit must be kept separate and disinfected (with thorough rinsing) after each use. Anyone who has contact with the horse must wash their hands immediately after dealing with him.
Ringworm requires an anti-fungal treatment, so contact your vet if you suspect your horse is suffering from it. They will also be able to rule out other similar conditions.