Texas Health and Safety Code - HEALTH & SAFETY § 822.005. Attack by Dog

(1) with criminal negligence, as defined by Section 6.03, Penal Code, fails to secure the dog and the dog makes an unprovoked attack on another person that occurs at a location other than the owner's real property or in or on the owner's motor vehicle or boat and that causes serious bodily injury, as defined by Section 1.07, Penal Code, or death to the other person;  or

(2) knows the dog is a dangerous dog by learning in a manner described by Section 822.042(g) that the person is the owner of a dangerous dog, and the dangerous dog makes an unprovoked attack on another person that occurs at a location other than a secure enclosure in which the dog is restrained in accordance with Subchapter D   1 and that causes serious bodily injury, as defined by Section 822.001, or death to the other person.