08-21-2013, 02:20 PM
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I generally like Quest (and Quest Plus), but my biggest concern with Quest would be the dosage. It doesn't have as big a safety margin as other dewormers, and you will probably have a hard time getting an accurate weight on your gelding unless you have access to a livestock scale. The usual methods (weight tape, or formula based on heart girth and length) aren't super accurate for adult horses, and IIRC they're even less so for immature horses. Quest is also highly effective, which could cause the same problems with impaction colic if the worm load is heavy.
I'd think doing an FEC would be your best course of action. If it doesn't come back clean, then regular Panacur or the Panacur Power Pac might be a good option (since it's a different class of drug than the ivermectin he got recently), then maybe a follow up FEC in a couple weeks. Then, once you've had your first hard frost consider using something that kills tapeworms (Zimectrin Gold, Equimaxx, or Quest Plus)