Pet stores owned by an Arizona family have purchased hundreds of dogs from “puppy mill” breeders cited for health problems and are breaking state and federal regulations, according to animal-cruelty activists.

Former workers also have reported concerns about the welfare of the puppies destined for the mall pet shops, volunteers from Animal Wellness Action and Bailing Out Benji said.

The activists have shared documentation they said shows the scope of the problems with authorities and have called for an investigation.

“These pet store owners are fraudulently representing to customers they don’t procure dogs from puppy mills, but in fact they are getting dogs from high-volume, out-of-state breeders with direct violations of the Animal Welfare Act,” Lain Kahlstrom, the director of state affairs for Animal Wellness Action, said.