Most of this everyone already should know... But this is the way I dance with Dreadhorn.
A tamer can solo Dread, if he keeps himself out of dreads crosshairs. He has a wicked teleporting spell that will drag you into the fray AND it does a L5 poison hit.
If you are constantly on your bandage macro you can keep your dragon up, but you MUST always have Arch Cure cued up and ready to cure yourself when Dread pulls you in for a hit. When you get pulled in you must stay calm until you are poisoned. After poisoning you have about 3/4 of a second to cure it. If the poison does any damage Dread will be on top of you. His Area affect(unknown elemental damage) spell will cause him to actively attack you if it does damage. Invis comes in handy but ive done Dread several times only casting Arch Cure and Heal(for the Dragon).
<Bandage Target
<Cast Arch Cure
<Cast Invisibility
<Target Self
It can take from 25-40 heart pounding minutes to solo him. (I usually sweat alot while soloing DH)