July 26, 2012 19:27
Question: I have added a new horse to our herd. I have dewormed once.
My question is: how long should I wait to do a second dose?
It's been a week and there were lots of worms in the feces.
Answer: You can deworm again anytime now. The only reason for 2 dewormings is to avoid worm impaction from big kill off.
Dr. Lisa Wayman DVM