Is the Landlord Liable for a Tenant's Dog Bite in Illinois?

By the FigureMyTax Editorial Team · How we calculate

Illinois's unusually broad definition of "owner" opens a real statutory path to landlord liability that narrower definitions in other states simply don't offer.

A broader owner definition than most states

Under 510 ILCS 5/16, "owner" includes anyone who keeps or harbors a dog, has it in their care, acts as its custodian, or knowingly permits it to remain on premises they occupy — categories that can reach further than just the tenant holding legal title to the dog.

A pet-friendly lease alone isn't enough

Simply allowing pets under a lease doesn't automatically make a landlord an owner. The statute's broader categories require something closer to actual care, custody, control, or knowing permission tied to the specific dog — not just a general lease provision permitting tenants to have pets.

What would actually qualify a landlord

Evidence that the landlord fed, sheltered, or exercised real control over the dog, or knowingly allowed it to remain on premises they directly occupied or closely managed, moves closer to the statute's "keeps or harbors" or "knowingly permits" language — a meaningfully different showing than simply owning the building.

Negligence remains available either way

Even where the broad owner definition doesn't clearly apply, a landlord who knew a tenant's dog was dangerous and had the practical ability to address it — but failed to act — can still face liability under ordinary negligence principles, independent of the Animal Control Act's owner framework.

This is general information, not legal advice. Landlord liability for a tenant's dog turns heavily on the specific facts and what the landlord actually knew or controlled. Confirm how this applies to your situation with a licensed Illinois attorney.