Oprah Winfrey dedicates show to her dead dog

Chat show queen Oprah Winfrey is set to dedicate a show to her cocker spaniel, Sophie, who died last month from kidney failure.

"Sophie gave me 13 years of unconditional love. She was a true love in my life," Winfrey says on the broadcast scheduled to air Friday.

The show features special correspondent Lisa Ling investigating puppy mills, which she calls "horrific" and "haunting."

Winfrey says the show is "for anybody anywhere who loves a dog, has ever loved a dog, or just cares about their basic right to humane treatment."

While Sophie was not a product of a puppy mill, and Winfrey's three current dogs were adopted from breeders, Winfrey says in the future she would look to adopt from an animal shelter.

"I would never, ever adopt another pet now without going to a shelter to do it. I am a changed woman after seeing this show," she says.