You can read it here. This is Whitmires committee substitute for HB 1451, and it is headed to the floor of the Senate today.
http://www.legis.state.tx.us/tlodocs/82R/billtext/html/HB01451S.htmThere is an exemption for Dogs that are exclusively used to herd livestock, and Hunting Dogs used to Point, flush, and retrieve.
The term "livestock" as defined in the Ag-Code is found in 1.003 of the Ag-Code.
The definition is as follows,
Sec. 1.003. DEFINITIONS. In this code:
(3) "Livestock" means cattle, horses, mules, asses, sheep, goats, llamas, alpacas,
exotic livestock, including elk and elk hybrids,
and hogs, unless otherwise defined.