In this subtitle the following words have the meanings indicated. “Livestock” means cattle, swine, sheep, horses, asses, mules, or goats notwithstanding any other provision of this article. “Livestock dealer” means any person who engages in the business of selling, buying, exchanging, or transferring livestock at any place and at any time. “Livestock market” means an established location where livestock are offered for sale. “3–D livestock” means livestock that is unable to rise even with assistance (a “downer”), is debilitated, or is diseased. “Trucker or hauler” means a person who engages in the business of transporting livestock in trucks or other conveyances to or from a farm, a livestock auction, sales agency, or dealer’s premises.