Worms in horses – why should I deworm my horse?

The topic of deworming is a recurring discussion among horse owners. For anyone wondering whether it is necessary to deworm their horse, the answer is yes. Anyone who has ever seen how vast numbers of worms can completely block parts of the small or large intestine during colic surgery will no longer ask this question. Without treatment, worm infestation can become life-threatening for horses. Initially, a noticeable increase in tail rubbing may be an indication of this. As the infestation progresses, internal organs can be damaged and colic can occur. The horse loses weight despite being fed adequately. The parasites weaken the horse more and more. Regular deworming is necessary to reduce the infestation to a level that is tolerable for the horse's organism. It is almost impossible to completely rid the horse of worms, as new infections will always occur through the environment. There are two methods of deworming: strategic and selective deworming. You should avoid alternative deworming methods.

INHALT
Strategic deworming Selective deworming What else is important?
Strategic deworming

Strategic deworming, which is often used in large stables, involves treating all horses with the same preparation at the same time on a regular basis. This is done seasonally (during the grazing period from spring to fall), two to four times per calendar year. Different groups of active ingredients are used seasonally to target specific worm species and prevent the parasites from developing resistance.

Horse with worms
Selective deworming

With selective deworming, a worming treatment is only administered if a parasite infestation has actually been detected. This type of deworming is less stressful for the horse's body, as treatment is only carried out if an infestation has been proven. Another advantage of selective deworming over strategic deworming is that it reduces the development of resistance.

In selective deworming, fecal samples are taken from the horse every two to three months for three days and examined for parasites and their eggs by a laboratory or your veterinarian. If a worm infestation is detected, the appropriate veterinary medication is administered. To prevent immediate reinfection, all stalls must be well mucked out and the paddocks must be cleaned of manure. If no parasites or their eggs are found in the feces, fecal samples should be sent in for testing again after two to three months, as worm infestation can still be present even if the fecal sample is negative, as the eggs are not excreted continuously.

Horse droppings with worms
Worm infestation is not always obvious
What else is important?

Whether strategic or selective, in a stable with multiple boarders and shared paddock and pasture use, everyone must participate. All measures should be carried out simultaneously. Subsequent stable hygiene must also extend to all stalls and open areas used by the horses. This is because deworming is useless if one horse is not dewormed and excretes the parasites in its feces, which are then ingested by the next horse in the pasture. The recommendation for deworming is to allow three days of special aftercare and to suspend group housing during this time.