A. Ah, the dreaded summer itchies! I suspect your mare is either under attack by one or more external parasites (midges, ticks, black flies, gnats, etc.) that are irritating her skin to the point of intense itchiness or to which she is allergic, OR she is photosensitive.

Photosensitivity would make sense if the pen to which she’s been restricted lacks access to shade which may have been previously available in the pasture. Try keeping her out of the sun for a couple of weeks if possible to see if that improves her condition and comfort level. Keeping her in during daylight hours and putting her out at night should keep her from going stir-crazy.

You might also want to consider applying an insecticide to her mane and tail to prevent parasite infestations. You should check with your vet first, as you don’t want to use any chemicals on already-irritated mane and tail tissues that may make things worse instead of better.