For nine months, a PETA investigator worked undercover inside the filthy, deafeningly loud kennels of Professional Laboratory and Research Services, Inc. (PLRS). Inconspicuously tucked away in rural North Carolina, PLRS takes money from huge pharmaceutical companies to test insecticides and other chemicals used in companion animal products. Bayer, Eli Lilly, Novartis, Schering-Plough (now Merck), Sergeant's, Wellmark, and Merial, the maker of Frontline flea and tick products, are some of the corporations that have paid PLRS to force-feed experimental compounds to dogs and cats and smear chemicals onto the animals' skin.

PETA's investigator found that toxicity tests were just part of what the animals endured. Laboratory workers appeared to despise the animals in their care—they yelled and cursed at cowering dogs and cats, calling them "asshole," "motherfuckers," and "bitch"; used pressure hoses to spray water—as well as bleach and other harsh chemicals—on them; and dragged dogs through the facility who were too frightened to walk.

Video evidence shows that terrified cats were pulled from cages by the scruff of the neck while workers screamed in their faces and that a cat was viciously slammed into the metal door of a cage. One worker grabbed a cat and pushed him against a chain-link fence. When the cat fearfully clutched at the fencing with his claws, the worker jerked him off the fencing, saying she hoped that the cat's nails had been ripped out.

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After a supervisor gave one dog an anesthetic that was past its expiration date (and likely administered too little of it), the supervisor pulled out one of the animal's teeth with a pair of pliers. The dog trembled and twitched in apparent pain, and the supervisor continued with the procedure despite the dog's obvious reaction. Workers repeatedly cut into one dog's tender, blood-filled ear, draining blood and pus but never treating the underlying cause of the dog's suffering and apparently causing the ear to become infected.

http://www.peta.org/FeaturePLRS.asp