Trespassing, Provocation & the Burden of Proof

By the FigureMyTax Editorial Team · How we calculate

Illinois's strict liability statute comes with a procedural wrinkle that flips the usual script on who has to prove what.

A flipped burden on provocation

Under 510 ILCS 5/16, the statute's own text requires the attack to be "without provocation" as an element the plaintiff must establish — a different arrangement than the common law, where provocation is typically the defendant's affirmative defense to raise and prove. This means a dog bite victim bringing a claim under the Act needs to be prepared to show they didn't provoke the dog, rather than simply waiting for the owner to raise it.

Trespassing takes you outside the statute entirely

The statute only protects someone peaceably conducting themselves somewhere they may lawfully be. A trespasser, or someone committing a crime at the time of the attack, falls outside that protection and would need to pursue a different, generally harder-to-prove legal theory.

What "peaceably conducting himself" covers

Generally, ordinary, non-threatening behavior consistent with lawful presence. Someone performing their job duties — a mail carrier, utility worker, or delivery person — is typically covered, as is anyone simply going about their lawful business where they had a right to be.

The general comparative negligence rule still applies

Separate from the statute's own provocation-and-lawful-presence framework, Illinois's general 51% fault bar under 735 ILCS 5/2-1116 governs how the victim's broader conduct — beyond just provocation of the dog itself — affects what they ultimately recover.

This is general information, not legal advice. Whether an exception applies depends heavily on the specific facts. Confirm how these rules affect your case with a licensed Illinois attorney.