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Wolf Spider Bites on Dogs – A Vet Reviewed Safety Guide

Elizabeth Gray

By Elizabeth Gray

Wolf Spider

Vet approved

Dr. Luqman Javed Photo

Reviewed & Fact-Checked By

Dr. Luqman Javed

DVM (Veterinarian)

The information is current and up-to-date in accordance with the latest veterinarian research.

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With over 250 species found in North America alone, wolf spiders are one of the most widespread eight-legged species. The chances of your dog encountering a wolf spider are high, although the arachnids are not naturally aggressive. If your dog gets a wolf spider bite, you should know that their bites are typically not considered dangerous or life-threatening unless your pet suffers an allergic reaction to the venom.

You should contact your vet if you suspect a wolf spider bite, but it’s not usually an emergency, unlike bites from two other spider species that we’ll discuss in this article. We’ll also go over the signs of an allergic reaction since this response can be dangerous to your dog.

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Wolf Spider Bites: What to Watch For and What to Do

Wolf spiders are not aggressive and usually will only bite your dog if they feel threatened. Unfortunately, curious dogs can easily be considered a threat by the spider! Almost all spiders contain at least some venom, but their prey is often very small when compared to a dog, therefore the bites are usually not considered an immediate medical emergency. Only a few species of spiders have neurotoxins in their venom that are dangerous for dogs.

Unless you spot your dog bothering a wolf spider, you may not realize they’ve been bitten until after it’s happened. Signs of a wolf spider bite include:

Signs of a Wolf Spider Bite
  • Swelling and redness at the bite site
  • Itching
  • Licking the bite
  • Limping or other signs of pain

Again, spider bites can be hard to identify unless you see the offending creature near your dog. If you notice any of these signs, have your dog checked by a vet. Spider bites can get infected without proper care, and your dog may also need medications for pain.

Itchy Dog_shutterstock_TamaraLSanchez
Credit: TamaraLSanchez, Shutterstock

Allergic Reactions to Wolf Spider Bites

If your dog is allergic to wolf spider venom, it can take only minimal exposure to trigger a  reaction. You likely won’t know your dog is allergic before the bite, so it’s important to be aware of the signs of a reaction.

Signs of an allergic reaction to a wolf spider bite can be mild to life-threatening depending on the extent of the allergic reaction in your dog. This level of reaction is an individual trait unique to each dog; there is no breed or gender bias towards a potential spider bite allergy. The signs of spider bite allergies include the following.

Signs of An Allergy to Spider Bites
  • Swelling and redness at the bite area
  • Hives
  • Vomiting
  • Excessive Itching
  • Trouble breathing

Getting your dog to the vet quickly is vital if you suspect an allergic reaction. If your dog is having trouble breathing, it is an emergency.

Black domestic dog are stoop body and vomit mucus
Image Credit: Mumemories, Shutterstock

Dangerous Spider Bites: What to Look For and What to Do

In North America, two species are considered venomous to dogs: black widow spiders and brown recluse spiders.

Black Widow Spiders

Female black widow spiders are more dangerous than males. They are small, dark gray-black spiders with a distinct red or orange hourglass shape on their abdomen. They are found in dark locations like basements, sheds, air conditioning units, and wood piles.

Black widows produce a neurotoxin, and dogs that are bitten usually experience immediate pain. Signs of a black widow spider bite usually appear within 8 hours and include the following:

Signs of a Black Widow Spider Bite
  • Muscle tremors and cramping
  • Vomiting
  • Bruising
  • Fever
  • Pain to the touch
  • Restlessness
  • Fast heart rate
  • Excessive salivating
  • Facial swelling (if bitten on face)
  • Belly pain or a firm belly
  • Skin changing color or looking abnormal

If you suspect your dog has suffered a black widow spider bite, prioritize taking your dog to a vet as soon as possible. If you can carefully bring the spider with you in a jar, this may help with identification. However, it isn’t necessary to prioritize capturing the spider. Remember that a picture of the spider can be just as good for the purposes of identification.

Black Widow Spider
Image Credit: marceloterapeuta, Pixabay

Brown Recluse

The brown recluse is smaller than the black widow and more likely to be found indoors. They like dark, warm environments. These spiders are yellow-brown with darker, violin-shaped markings on their body.

Brown recluse spiders are shy and only bite if they feel cornered. Signs of a brown recluse can take longer to appear, and bites are not usually painful at first. Brown recluse venom causes tissue damage.

Brown recluse bites usually develop a blister, followed by a larger lesion that looks like a bullseye. As the venom damages your dog’s tissues, they may develop a fever or become lethargic. Sometimes, a brown recluse bite can lead to kidney damage and issues with blood clotting.

Brown recluse bites are usually easier to identify because of their characteristic bullseye look. Have your dog seen by a veterinarian if they suffer a brown recluse bite. Infection, pain, and the more serious effects we mentioned all require treatment.

Brown Recluse
Image Credit: Nick626, Shutterstock

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Wolf spiders may look scary, but their bite is usually no more serious to your dog than a bee sting or large insect bite. Talk to your vet if you suspect a wolf spider bite, but it’s usually not an emergency unless your dog has an allergic reaction. The two much smaller spider species—the black widow and brown recluse—pose more of a threat to your dog. Try not to let your dog explore woodpiles or dark corners outside where black widow spiders may be lurking. Again, most spiders aren’t looking to bite and will only do so to protect themselves.

See also: My Dog Ate a Spider! Will They Get Sick? Vet Approved Tips

Featured Image Credit: Katarina Christenson, Shutterstock

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