I live near Houston and I know the HSPCA has done investigations into pet stores before. You need to document the neglect. Take pictures of the mite infested mice and any other mistreated animals. Dry water bowls, unsecured or unsuitable caging, anything. Then I would call your local ASPCA. They may end up telling you to take your complaint to the sheriffs department directly, before they can get involved. But either way you should be able to do something