My Cat Ate a Spider

My cat ate a spider

We’ve all heard the phrase, ‘Curiosity killed the cat.’ While that might not literally be the case, our feline companions have an innate curiosity and playfulness that often lead them to consume things that might not necessarily be part of their regular diet. Among these, spiders seem to be an attractive catch. Whether you’ve found your cat with a spider in their mouth or have noticed a recurrent tendency to feast on these eight-legged creatures, you’re likely wondering about the potential implications. This comprehensive guide will delve into the critical questions surrounding this peculiar feline behavior.

Will My Cat Be OK After Eating a Spider?

Typically, if your cat consumes a common house spider, it’s unlikely to cause any major health issues. Spiders are part of the natural diet of many wild cats, and their domestic counterparts have inherited this predilection. The primary concern arises when the spider consumed belongs to a venomous species.

Can a Cat Get Sick from Eating a Spider?

While many spiders are harmless, some possess venom potent enough to cause illness in cats. In most cases, though, the spider would need to bite your cat during the struggle, as the venom glands are not usually consumed in the process of eating the spider. Most spiders are not venomous to cats and, if eaten, might cause only mild gastrointestinal upset, if any at all.

However, if you suspect your cat has eaten a venomous spider, symptoms to watch out for include loss of appetite, lethargy, fever, drooling, or swelling around the mouth or throat. These symptoms can indicate a potential poisoning situation, necessitating immediate veterinary attention.

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Why Does My Cat Keep Eating Spiders?

Cats are predators at heart, and their natural instincts often kick in when they encounter small, moving creatures like spiders. This behavior is part instinct, part play. Cats enjoy hunting, and spiders make for an engaging target.

In terms of nutrition, spiders can provide a small amount of protein. However, they’re not a significant or necessary part of a domestic cat’s diet, which should be balanced and complete with commercial cat food. If your cat’s spider consumption becomes frequent or obsessive, it’s worth discussing with your vet, as it could indicate boredom or nutritional deficiencies.

What Happens if My Cat Is Bitten by a Spider?

Spiders generally only bite in self-defense, so a spider bite could occur if the spider feels threatened during a cat’s playful antics. The severity of the bite will largely depend on the species of spider.

A bite from a harmless spider might cause minor swelling, redness, or itchiness, which should subside on its own. However, a bite from a venomous spider, such as a black widow or brown recluse, can cause severe illness, including muscle pain, paralysis, dermonecrotic wounds, or even systemic toxicity. If you suspect a venomous spider has bitten your cat, seek veterinary attention immediately.

Which Spiders and Insects Are Dangerous to Cats?

While most spiders and insects are harmless to cats, a few pose a significant threat. The two most dangerous spiders are the black widow and the brown recluse. These spiders can cause severe reactions in cats if they bite. However, remember that they generally reside in dark, undisturbed areas and prefer to avoid interaction.

Other potentially harmful insects to cats include bees, wasps, and certain species of ants, whose stings can cause severe allergic reactions. Ticks and mosquitoes can also pose a risk, as they can transmit diseases like Lyme disease or heartworm.

How Are Spider Bites on Cats Treated at the Veterinary Clinic?

Treatment for spider bites in cats will depend on the severity of the symptoms and the type of spider responsible for the bite. In many cases, antivenom may not be necessary or available.

Veterinarians often administer pain relief, anti-inflammatories, and fluid therapy to manage symptoms. If necrotic skin lesions occur, especially with a brown recluse spider bite, surgical intervention might be necessary. If caught early, most cats can recover well with supportive care.


In essence, while it’s generally safe for your cat to eat spiders, it’s crucial to monitor their behavior, especially if venomous spiders are common in your area. Ensuring they are not exposed to potentially venomous species and checking for symptoms of illness after an encounter can help keep your feline friend safe. If your cat shows an unusually keen interest in eating spiders, it may be a good idea to enrich their environment with toys and interactive games to divert their predatory instincts towards safer outlets. And remember, when in doubt, always consult with your veterinarian.

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