MILWAUKEE – TODAY’S TMJ4’s I-Team has been investigating Wisconsin puppy mills for years.

Last year, the I-Team’s Emmy winning investigation took viewers inside Puppy Haven, the puppy mill that Friday agreed to sell some 1,200 dogs to the Wisconsin Humane Society.

Puppy Haven is the largest puppy mill in Wisconsin, and animal experts say it is also the most disgusting and most dangerous for both puppies and their breeding parents.

Puppy Haven is in Kingston; 30 miles north of Madison.

The I-Team’s hidden cameras saw puppies inside confined to small, metal cages. They stand on wire floors, damaging their paws.

One little guy, Buddy, had his paw completely chewed off by his overstressed mom.

Teri Woodchuck, an animal rescuer, says Buddy will never have a normal life.

"That comes from stress, having puppies in a stressful situation and they don't know what they're doing and they'll just gnaw,” Woodchuck said.

The I-Team tried to talk to a Puppy Haven manager about Buddy.

John Mercure: "You guys have dogs here that are so stressed out that they're chewing the limbs off other dogs."

"No. They're not. I don’t know where you got it from,” the manager said.

John Mercure: "We've seen it."

"No, it's not from here,” the manager said.

John Mercure: "Yeah. It's from here."

“No,” the manager said.

The I-Team’s hidden cameras showed the breeding dogs live in pens covered in feces. The dogs are forced to walk through it.

Following our investigation extensive puppy mill legislation was drafted. Bickering amongst our state legislators has prevented it from becoming law.