Roundup herbicide, or the active ingredient glyphosate, may be toxic to horses.

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From the faq - When can grazing resume after spraying roundup brand herbicides? Proper translocation prior to animal re-entry is imperative to effective weed control. To ensure proper weed control and forage removal, Monsanto recommends grazing not resume for 3 to 5 days after spraying.

How Long After Spraying Roundup Is It Safe For Pets? Roundup can take half an hour to two hours or more to completely dry, but this depends on the weather and your environment. To be on the safe side, experts recommend waiting 24 or 48 hours before letting your pets into the treated area.

seven to ten days Always follow grazing recommendations after herbicide application. Herbicide may make toxic weeds more palatable to horses. Horses should be excluded from the sprayed area for seven to ten days after treatment if poisonous plants are present. Herbicides alone will not result in a weed-free pasture.

The potential for loss of homeostasis and development of disease due to glyphosate is arguably greater in the horse than in the human. Glyphosate has been linked to endocrine disorders, obesity, fertility problems, methylation problems (and detoxification pathways) and chronic disease.

Several countries have restricted or banned the use of glyphosate because of its link to an increased risk of cancer. Glyphosate is the active ingredient in a number of herbicides, including Roundup.

It's time to ban it. Roundup's main ingredient is a probable human carcinogen, but it's almost impossible to avoid coming into contact with it. The EPA must ban it, unless and until independent research proves it safe.

A withholding period for grazing stock is not required. However, it is recommended that grazing of treated plants be delayed for one day after treatment of annual weeds, or 7 days of perennial weeds are present, to ensure absorption of Apparent Glyphosate 450 Herbicide.

yet research now shows that isn't true! So it's safest to keep your dog off any Roundup treated areas, whether they're wet or dry.

No. When Roundup is dry, it's safe for humans and pets. Just be sure that it's 100 percent dry as the wet product can be hazardous.

GrazonNext HL has no grazing restrictions for any class of grazing animals, including horses1. Animals can be in the pasture during application. Any herbicide ingested by the animals while grazing the site will be excreted in their urine and manure.