Can Cats Eat Spiders? The Full Answer
Cats are obligate carnivores evolved as solitary hunters. Hunting arthropods—insects, arachnids, small creatures—is hardwired predatory behaviour providing mental enrichment and natural exercise. A cat hunting spiders indoors is engaging in species-appropriate behaviour. The spider itself, if ingested, poses minimal risk. Spider venom is a protein cocktail designed to paralyse insects and small arthropods, not mammals. Cats' larger body size and different physiology mean they're far less susceptible to spider venom than insects are. Stomach acid rapidly denatures venom proteins, further neutralising any threat from a dead spider ingested.
The real risk is being bitten during the hunt. Venomous spiders (Sydney funnel-web, Sydney brown snake spider, redbacks in Australia; recluse spiders in North America) can inflict bites that cause systemic envenomation. However, most household spiders are non-venomous or have venom so weak it doesn't affect mammals. Common house spiders (Ixodida spp., wolf spiders, jumping spiders) do not pose a threat to cats. Redback spiders in Australia have venom that affects cats more than some other mammals, but bites on healthy adult cats are rarely fatal—though they can cause muscle pain, tremors, or localised swelling.
The likelihood of a cat being bitten by a venomous spider while hunting is low. Spiders are poor at defending; they flee or attempt to hide rather than bite aggressively. A cat would need to be unlucky (or the spider particularly aggressive) for a bite to occur.
How to Safely Serve Spiders to Your Cat
- Allow natural hunting in normal environments
- Do not intentionally serve spiders to cats
- Monitor for signs of venomous spider bite (swelling, lethargy, tremors)
- Remove dead spiders from living areas if concerned about pest accumulation
- In areas with high populations of dangerous spiders, consider enclosed cat environments
Frequently Asked Questions
Is spider hunting normal behaviour for indoor cats?
Yes, absolutely. Hunting spiders and other small arthropods is natural predatory behaviour providing enrichment.
Can venom from a dead spider harm a cat if ingested?
Minimal risk. Spider venom is denatured rapidly by stomach acid. A dead spider swallowed poses almost no venom risk.
Which spiders are dangerous to cats in Australia?
Redback spiders and Sydney funnel-web spiders have venom affecting mammals. Bites are rare and usually not fatal in healthy adult cats.
What should I do if my cat was bitten by a spider?
If you observe a bite or suspect envenomation (swelling, lethargy, tremors), contact your vet immediately.
Should I kill spiders in my home to protect my cat?
Unless you live in an area with dangerous spiders, spider hunting poses minimal risk. Most household spiders are harmless.
