You love your dog. You love your lawn. But can you really have both—a vibrant, weed-free yard and a safe space for your pet to play?
And its an important one: Is pre-emergent safe for dogs, or are you putting your pup at risk for the sake of greener grass?
We understand your concerns. After all, were pet lovers, too. Thats why weve made it our mission to partner with you, not just sell to you.
And yes—with proper timing, correct application, and a little guidance from our expert team, pre-emergents can be safely used on pet-friendly lawns.
This guide will walk you through everything you need to know to keep your lawn pristine and your pets protected.
Is Crabgrass Preventer Safe For Dogs?
As a dog owner, keeping your lawn healthy and weed-free is important. But you also want to make sure any lawn care products you use are safe for your furry friend. Crabgrass can quickly take over a lawn, leaving unsightly bare patches. Crabgrass preventer helps stop this weed before it starts. But is it safe to use if you have dogs who play and lounge on the grass?
What Is Crabgrass Preventer?
Crabgrass preventer, also called pre-emergent herbicide, is a weed control product designed to stop crabgrass and other annual weeds from sprouting. It contains synthetic chemicals that inhibit the growth and development of newly germinated weed seeds. When applied early in spring before crabgrass emerges, it provides season-long control.
The active ingredients in crabgrass preventers vary by brand but often include
- Pendimethalin
- Prodiamine
- Dithiopyr
- Oryzalin
These ingredients work by disrupting cell growth in weed seedlings’ roots and shoots. Without the ability to establish a root system, the weeds die off. Crabgrass preventer is typically applied as a liquid spray or granular spread over the entire lawn area. The chemicals remain active in the soil for 2-4 months before breaking down.
Are Crabgrass Preventers Harmful To Dogs?
Most veterinarians and lawn experts agree that modern crabgrass preventer chemicals pose little risk to dogs when the products are used as directed. The active ingredients are present in low concentrations and are not highly toxic to canines.
However, it is still smart to exercise caution when applying any lawn chemical, even if the package states it is “safe for pets.” The potential exists for irritation or illness if a dog ingests or absorbs enough of the chemicals. According to veterinarian Dr. Kara, signs of a reaction can include:
- Pawing at the mouth
- Drooling
- Difficulty swallowing
- Vomiting
- Diarrhea
- Dilated pupils
- Seizures
Small dogs tend to be more vulnerable than larger breeds. Puppies and senior dogs also have increased sensitivity. To minimize risks, always follow the label directions carefully and take steps to limit your dog’s exposure.
Tips For Using Crabgrass Preventer With Dogs
When using crabgrass preventer, keep these tips in mind to protect your dog:
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Read the label thoroughly and never exceed the recommended amount. More is not better.
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Choose pet-safe application times when your dog can stay indoors. Avoid treating the lawn if your dog is outside.
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Prevent access to treated areas until the product dries completely, usually within 24-48 hours.
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For granular products, dilute with sand for safer spreading. Never let dogs in the area during application.
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Lightly water after applying to dilute any residual chemicals left on the grass blades.
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Pick up dog toys and bowls from the lawn before application so they don’t become contaminated.
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Keep dogs off treated grass as long as possible, ideally until after the first mowing.
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Use barriers if needed to keep dogs away from application areas.
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Bathe dogs who get into a recently treated area immediately.
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Seek veterinary help if you suspect your dog ingested crabgrass preventer.
By following label precautions and limiting exposure, the small risk to dogs is minimized. But many vets recommend avoiding use around puppies and elderly or ill dogs when possible.
Natural Alternatives To Crabgrass Preventer
If you want to steer clear of synthetic chemicals entirely, several natural options can suppress crabgrass:
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Corn gluten meal – Made from corn, it inhibits root development. Must be applied pre-emergence.
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Vinegar – High concentrations (20%+) provide some crabgrass control but require multiple applications.
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Soil solarization – Covering soil with plastic “bakes” and kills seeds in hot months.
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Preventive mowing – Keeping turf taller deprives crabgrass of light.
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Improved drainage – Crabgrass thrives in moist soil. Aerating and amending soil to drain faster helps.
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Overseeding – Thickening turf in fall with grass varieties leaves little room for crabgrass.
These organic approaches take more effort but are completely safe for dogs. An integrated program works best for effective, dog-friendly crabgrass management.
The Bottom Line
When used as directed, most crabgrass prevention products pose low risk to canine health. But it’s always smart to minimize exposure. Natural alternatives also give dog owners chemical-free options.
With wise product selection, careful application, and common sense precautions, you can keep your lawn crabgrass-free without endangering your beloved pup. Your dog gets to roam in a lush, beautiful yard, and you’ll have peace of mind knowing his space is safe.
Are Pre-Emergents Toxic to Dogs?
Its a valid concern. We all want to protect our pets as fiercely as we protect our lawns. So often, we hear customers asking, “Is pre-emergent toxic?”, with a clear focus on its effects on their pets.
But heres the truth: pre-emergents can pose a risk if theyre not applied correctly.
Some common ingredients in pre-emergent herbicides include:
- Pendimethalin
- Prodiamine
- Dithiopyr
While highly effective at preventing weed growth, these ingredients can be harmful to dogs if ingested or if they come into contact with the product before its set.
Potential symptoms of exposure in dogs might include:
- Vomiting
- Lethargy or uncoordinated movement
- Excessive drooling
- In rare cases, seizures or neurological issues
But heres the key: Lawn Synergys pre-emergents are safe when used as directed.
Our products are designed for effectiveness and safety, especially when:
- Granular products are watered in right away, binding them to the soil.
- Liquid formulas are allowed to dry thoroughly (usually within 24–48 hours, depending on humidity and temperature).
We include precise, easy-to-follow instructions with every product, and our expert team is always available to walk you through the safest way to apply.
When can pets go on the lawn after pre-emergent?
You should wait until the application is fully settled. That typically means:
- Granular pre-emergent: After watering in and the lawn is dry.
- Liquid pre-emergent: Once the surface is completely dry (usually 24–48 hours).
If in doubt, wait a little longer and err on the side of caution.
Non Toxic Human/Pet safe weed killer
FAQ
How long after crabgrass preventer can dogs go outside?
If you’re unsure if the lawn is dry, we recommend waiting 24 hrs before allowing pets back into the treated area. Scotts C. Helpful?
Is Scotts crabgrass Preventer safe for pets?
Answer: Scotts Halts Crabgrass and Grassy Weed Preventer is safe for pets if used correctly. You want to keep pets out of the area until it has fully dried.
What crabgrass killer won’t harm dogs?
Green Gobbler Vinegar Weed & Grass Killer
Although this formula is considered pet-safe, there are warnings on the label to wait 48 hours before entering the area that you sprayed. Green Gobbler weed killer effectively gobbles up and snuffs out dandelions, crabgrass, mold, and all types of weeds and grasses.
How long after spraying the yard can dogs go out?