Regarding tail
rubbing, I don’t know if you have flies or midges or anything like that
annoying your horses at this time of year, but my horses rub their tails when
they are bothered by flying insects. I’ve found that if I can keep the
bugs off of them, they don’t rub. Don’t know if there’s
anything like that going on with yours in this wet, wet year, but worth
thinking about. I’ve also found that it helps if I put something like Vaseline
on their ‘opening’ and on the underside of the tail. Probably not relevant
at this time of year, but just suggestions if the worming doesn’t help.