Is Brown Recluse Spider toxic to dogs?

Extreme severity No safe amount — No amount is considered safe.

Yes. Even a small amount can be life-threatening — treat any exposure as an emergency and contact a vet immediately.

Symptoms to watch for

Pain
Itching
Bulls-eye lesion
Vomiting
Fever
Lethargy
Bleeding disorders
Bruising
Abnormal clotting tests
Organ damage
Liver damage
Kidney damage
Severe skin wounds
Seizures
Low blood pressure
Organ dysfunction

How vets treat it

No specific antivenom is available; treatment is symptomatic and supportive. Immediate veterinary consultation is required for life-saving care.

Why it's dangerous

The venom contains a mixture of phospholipases and proteases that cause tissue destruction, severe skin wounds, and systemic effects like organ damage and bleeding disorders.

Toxic compound: sphingomyelinase D

Good to know

The spider is identified by a violin shape on its dorsal cephalothorax and ranges from 8-13 mm in length. Venom strength varies significantly between individuals.

Sources

Pet Poison Helpline

This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.

More substances toxic to dogs

Black Widow Spider Extreme severity Coral Snake Extreme severity Rattlesnake Extreme severity Spiders Extreme severity Everything toxic to dogs →

Packaged food? Scan the barcode.

StrawPaw's food scanner reads the barcode on packaged products and flags ingredients that are risky for dogs and cats — before anything reaches the bowl.

Download StrawPaw for iOS