Problems just keep piling up for the already-shuttered Chelsea Kennel Club.

The state Attorney General’s Office has now filed a lawsuit against the accused former Seventh Avenue puppy mill — citing such allegations as store workers peddling dogs they knew were sick, whipping pooches that refused to stop barking and giving ill animals expired medication.

“In one instance, a consumer had his puppy just six days before it died in an animal hospital,’’ according to a press release from AG Letitia James’ office Thursday.

The city Department of Consumer Affairs filed its own lawsuit against Chelsea Kennel in May, seeking nearly $4 million in fines.

“Even the sickest puppies were treated with defendants’ crackpot, back-alley home remedies,” the agency charged in its suit.

“Puppies with high fevers, persistent diarrhea, open wounds, severe conjunctivitis or persistent upper respiratory infections were given cold baths, aspirin, adult Robitussin and other medicines designed for humans, birds, cattle.”