Join Date: Jan 2011
Location: Southwest Missouri
Having been a horseperson my whole life and worked for a while at a boarding barn. Horses can and will have worms/parasites at one time or another. Especially where more than one horse is kept. We always worm on an 8 week/every other month schedule and we rotate wormers. We use Zemectrin Gold and Anthelcide EQ.
ETA: Sorry I'd address your question. For a horse who has not been wormed for a long amount of time or the worming history is not known it is best to worm that horse gradually for the reasons you gave. To fast a kill-off of worms can cause an impaction of the gut and colic can happen. What to do is this, give only a half a dose then the very next week give the remainder of the wormer dosage. Then in 8 weeks you can give a full dose all at once. It's just the initial worming that has to be done gradually.
Last edited by candandy49; 01-26-2011 at 11:59 AM.
Reason: didn't give advice on question