A website for a Texas-based company that provides canine blood products for veterinary transfusions nationally says it sources its blood "primarily from volunteer donors" and aims to "operate in a completely ethical, humane manner." But an animal rights group contends it has evidence that the Pet Blood Bank does the opposite, procuring its supply from a colony of about 150 greyhounds that live in squalor in dirt-floored pens. Photographs of the facility, which People for the Treatment of Ethical Treatment of Animals says a former blood-bank employee took between February and June, show kenneled dogs with open wounds, rotting teeth and toenails curling into their paw pads. The organization sent a letter Wednesday to the sheriff of San Saba County, where the company is located northwest of Austin, urging the seizure of dogs "being cruelly confined or unreasonably deprived of necessary food, care or shelter." A dispatcher said Friday that an investigation is underway. The former employee's accusations could not be independently confirmed. In an interview Thursday, Pet Blood Bank owner Shane Altizer did not deny that the images were taken there, but said they predated his 2015 purchase of the company or were "moment snapshots" unrepresentative of overall conditions now. The allegations provide a window into an industry that helps to save thousands of animals each year, although one that critics say needs more regulation. As the U.S. pet population grows and owners increasingly opt to treat injuries and other conditions with procedures requiring transfusions, animal blood banks are struggling to meet demand. Yet no federal standards exist, and only one state, California, regulates such operations and requires annual inspections. Veterinarian Anne Hale, former CEO of the nation's first and largest commercial animal blood bank, said she visited the Pet Blood Bank this summer and was "pleasantly surprised" to find dogs that appeared healthy and happy. After viewing the photos and video circulated by PETA, however, Hale said Friday that her assessment had changed. "It appears that the facility was 'cleaned up' before our touring," Hale said in an email. "I agree that