Have you ever thought of feeding your horse garlic (garlic powder) through his
feed !
Garlic does not only purifies the blood, it also keeps mosquitos and worms
away.
I give my horses garlic every evening through their feed and deworm them every
8 weeks.
In my opinion 'natural things' are always better to gave your horse daily then
chemical stuff.
Hanneke van Scheltinga
The Netherlands