Can You Give a Miniature Horse Too Much Wormer?

Written by jen davis
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Can You Give a Miniature Horse Too Much Wormer?
Minature horses are more likely to recieve wormer overdoses due to their small size. (Miniature Horse Face image by janr34 from Fotolia.com)

Horse wormer is designed to be given to a horse in doses based on the horse's weight. According to the American Miniature Horse Association, the average miniature horse weighs between 68 and 90.7kg. The average adult full-sized horse weighs close to 454kg. If a miniature horse receives a wormer dose for a full-sized horse, it is receiving five times the amount of wormer it should. Wormer overdose can have varying effects depending on the type of chemicals in the wormer.

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Fenbendazole-Based Wormers

Fenbendazole-based wormers are considered to be the safest of the wormers. Healthy horses can receive 100-200 times the standard dose without being seriously harmed. Safe-Guard is a fenbendazole wormer.

Oxibendazole- and Ivermectin-Based Wormers

Oxibendazole- and Ivermectin-based wormers are effective against a variety of worms and can be given at up to 60 times the recommended dose without seriously harming a healthy horse. A commonly used Oxibendazole wormer is Anthelcide EQ, while Zimecterin, Equimectrin and Ivermectin are common Ivermectin-based wormers.

Pyrantel Pamoate-based Wormers

Pyrantel pamoate-based wormers are safe at up to 20 times the recommended dose. Strongid and Exodus contain pyrantel pamoate.

Moxidectin-Based Wormers

Moxidectin-Based Wormers have been the topic of much debate because these products can severely harm or kill a healthy adult horse at five times the recommended dose. The typical tube contains at least enough wormer to treat a 544kg horse, which would translate into eight times the correct dosage for a 68kg miniature horse and would likely prove fatal. Quest is a moxidectin wormer.

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