Strict liability, with a narrow statutory out
Under Fla. Stat. §767.04, a dog owner is liable for a bite in a public place or lawful private place, regardless of the dog's former viciousness or the owner's knowledge of it. The statute applies to bites specifically, not other dog-caused injuries.
The owner escapes liability if they'd displayed a prominent, easily readable "Bad Dog" sign — but never if the victim was under age 6, and never if the injury resulted from the owner's own negligence. Florida courts have held the sign must actually be readable to the victim; if the victim was too young to read it, the exception doesn't protect the owner (Flick v. Malino, 1978).
The statute builds comparative fault directly into its text: any negligence by the bitten person that proximately caused the incident reduces the owner's liability by that percentage.