Is Glyphosate Weed Killer (Roundup) Safe for Dogs?
Why it’s a problem
Glyphosate itself is only mildly toxic; most illness comes from the surfactants in the formula, which strip protective oils and burn tissue. Dogs are exposed by licking sprayed grass, chewing sprayed weeds, or stepping in puddles of the spray. Undiluted concentrate splashed on skin or swallowed is far more serious than a dried lawn.
How to keep your pet safe
Keep dogs off treated areas until completely dry, generally about 24 hours, and rinse paws if contact seems likely. Store concentrate locked away and never pour leftovers into drink bottles.
Warning signs to watch for
Drooling, lip smacking, vomiting, diarrhea, red or irritated pads and muzzle, lethargy, reluctance to eat.
When to call the vet
If exposure happened while the spray was wet, wipe the mouth and paws with a damp cloth and call your veterinarian or a pet poison hotline, ideally with the product label in hand. Do not induce vomiting at home.
Common questions
My dog walked on grass sprayed with Roundup, is that bad?
If the lawn was already dry, a walk is very unlikely to cause harm. Rinse the paws anyway and watch for drooling or red pads; the danger is concentrated in the wet window right after spraying.
Is glyphosate safe for dogs once it dries?
For typical lawn use, dried residue is considered low risk. The worry is the wet interval after spraying, plus any concentrate spilled or stored where a dog can reach it.
More household hazards for dogs
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).