Beeston Animal Health Ltd Worms can affect all types of horses and ponies whether stabled or at grass. If they are not controlled they can cause weight loss, colic and in severe cases - death.
Pasture management plays a key part in worm control.
Do not overstock your pasture. Rest your pasture for six months if possible - frosts and hot sun kill larvae on the pasture. Make sure your horse always has enough to eat and do not feed him directly off the stable floor. Worm all horses in the same field on the same day with the same wormer. New horses should be wormed and stabled for 48 hours before letting out into the field of resident horses.