Originally Posted by themacpack
Are you certain that it is fleas? Fleas are fairly uncommon in horses - it can happen, but typically in conditions that are fairly bad to begin with - did she come from a bad situation? Lice are much more common parasites for horses and other large mammals to have.
That being said, since it *can* happen - your horse may well have fleas. I would suggest speaking to your vet about the best approach. Shampoos are not the most effective flea treatment (they work to a degree, but don't really address an infestation) - so they may be able to offer you something more effective and immediate.
Agree - unlikely that they are fleas but could be mites or lice. I would consult your vet.