Should I re-dose?

I dosed a four-month-old puppy (who is likely to have worms) with the correct amount of Drontal for its weight (3kg). I mixed the crushed tablet into a small amount of dog meat for easy application. A couple of hours later said puppy had his lunch-time feed of kibble. A further two hours later we embarked on a bumpy car journey resulting in sickness. The vomit looked like partially digested kibble but I am unsure what to do about the worming. As the puppy is likely to have worms, ideally if I need to re-dose I don't want to wait too long. But at the same time I don't want to overdose him, if he did have time to absorb part or all of the Drontal I gave him.

Does anyone have any advice as to what I should do?

Claire (aka scoutelicious on Blogger)