You want a weed-free lawn, but not at the cost of your dog’s health. Pre-emergent herbicides are common lawn care products, but many pet owners worry—are they safe for dogs?
This article breaks down how pre-emergent works, whether it’s dangerous for pets, and how to use it safely around dogs. We’ll also explain what signs to watch for if your dog has been exposed.
Is Pre-Emergent Safe for Dogs?
Pre-emergent herbicides are generally safe for dogs once they’ve been properly applied and dried. The danger comes during and immediately after application, especially if your dog walks on the treated area while it’s still wet or if they ingest granules.
If you follow label directions, keep pets off the lawn during application, and allow the product to dry or settle, the risk is very low. If your dog does get exposed or shows symptoms, contact your vet or a 24-hour emergency vet immediately.
What Is Pre-Emergent and How Does It Work?
Pre-emergent is a type of herbicide designed to prevent weeds from sprouting. It doesn’t kill existing weeds—it stops seeds from germinating in the first place. Most homeowners use it in early spring or fall as part of regular lawn care.
It comes in two forms:
- Granular: Spread with a broadcast spreader and often needs watering in
- Liquid: Sprayed directly onto the soil
Common active ingredients include prodiamine, pendimethalin, and dithiopyr. These chemicals target plant growth and aren’t meant for animal consumption—which is where the concern comes in.
When Is Pre-Emergent Dangerous for Dogs?
The most risky times for dogs are:
- Immediately after application: When the product is still wet or freshly spread
- Before it’s watered in: Dogs can step on granules and lick their paws
- If they ingest it: Eating grass or soil that contains pre-emergent can cause symptoms
Most products are considered low-toxicity if used correctly, but individual dogs can still react differently based on size, breed, and health history.
Signs of Pre-Emergent Poisoning in Dogs
If your dog has been exposed to or ingested pre-emergent herbicide, you may notice:
- Drooling or foaming at the mouth
- Vomiting or diarrhea
- Shaking, twitching, or weakness
- Lethargy or unusual behavior
- Loss of appetite
- Paw licking or skin irritation
These signs should never be ignored. If you suspect exposure, call your vet or visit a 24-hour animal clinic right away. Bring the product label or container with you if possible.
How to Use Pre-Emergent Safely Around Dogs
To make lawn care safer for your pets, follow these simple safety tips:
- Read the label: Only use pet-safe or low-toxicity products.
- Apply on a dry, calm day: Wind can carry chemicals into unintended areas.
- Keep pets indoors: Until the product is watered in and the grass is completely dry.
- Water in granular products: This helps them settle below the surface where dogs can’t access them.
- Mark treated areas: To remind yourself and others that it’s off-limits temporarily.
Most lawn products specify a re-entry time. Once this window passes—often 24 to 48 hours—it’s usually safe for pets to return to the yard.
Are There Pet-Safe Alternatives to Pre-Emergent?
Yes, if you’re concerned about chemical exposure, here are some alternatives:
- Corn gluten meal: A natural pre-emergent that also adds nitrogen to your lawn
- Hand weeding: Labor-intensive but chemical-free
- Mulch or landscape fabric: For garden beds and borders
- Pet-safe lawn care brands: Some companies make herbicides with pets in mind
Keep in mind that natural alternatives may not work as quickly or effectively as synthetic products. You’ll need to weigh convenience versus safety depending on your priorities.
What to Do If You Think Your Dog Was Exposed
If you think your dog walked through or ingested pre-emergent herbicide, follow these steps:
- Rinse paws immediately: Use water to remove any residue.
- Prevent further licking: Use a cone or distraction.
- Call your vet or a 24-hour emergency vet: Describe the situation and follow their advice.
- Watch for symptoms: Even if your dog seems okay initially.
Early treatment makes a big difference in avoiding complications.
Conclusion: Pre-Emergent Can Be Safe—If You Use It Right
Pre-emergent herbicides aren’t automatically dangerous for dogs, but they do require smart handling. Timing, product choice, and keeping your dog away during application are key to staying safe.
If you’re ever unsure or your dog shows symptoms, don’t guess. Use 24 Hour Emergency Vet to find a local clinic that can help you right away.
Your lawn can stay green—and your dog can stay healthy—with just a little extra care.