A Rebuttable Presumption, Not the One-Bite Rule
Maryland used to be a one-bite state. For incidents on or after April 8, 2014, owners are presumed to know their dog is dangerous.
The presumption
Under Courts and Judicial Proceedings §3-1901(a), evidence that a dog caused a person's injury or death creates a rebuttable presumption that the owner knew or should have known the dog had vicious or dangerous propensities. A victim no longer has to prove a prior bite. The owner may try to rebut the presumption, but in a jury trial the judge cannot rule that it has been rebutted before the jury returns its verdict.
The pit bull detour
From April 27, 2012 to April 7, 2014, incidents involving pit bulls were governed by Tracey v. Solesky, which imposed strict tort liability on pit bull owners and their landlords. The legislature replaced that breed-specific rule with the current statute, which applies to every breed alike.
Liability regardless of knowledge: dogs at large
Section 3-1901(c) separately makes an owner liable for any injury, death or loss caused by a dog running at large, with exceptions for trespassers, people committing crimes, and people who tease, torment, abuse or provoke the dog. Under that provision, what the owner knew is beside the point.
Other routes remain open
Subsection (d) preserves any other common law or statutory cause of action. A victim can also sue in negligence — and a violation of an animal control law, such as a leash ordinance, is evidence of negligence in Maryland.
A local personal injury attorney can review your claim — many offer a free consultation.
Official sources
This is general information, not legal advice. Which theory applies, and how strong your evidence is under it, depends on the specific facts. Confirm your situation with a licensed Maryland attorney.