NASCAR driver Greg Biffle considers his three dogs -- two boxers (Foster and Gracie) and a mix (Savannah) -- part of his family. And he's not alone.

So when something is wrong with the dog, owners will do whatever they can to fix the problem.

On Saturday's "Dog Whisperer" with Cesar Millan on Nat Geo WILD, Biffle is featured when self-taught dog trainer Millan heads to Halifax Humane Society outside Orlando, Fla., to work with various dogs.

Greg Biffle's foundation -- started in 2005 by Greg and Nicole Biffle to create awareness and serve as an advocate to improve the well-being of animals -- provided a grant to the facility.

And Biffle wanted to be there in February to see Millan work his magic.

"We went to this local shelter and worked with a few dogs. One was cage aggressive. It's harder to adopt a dog like that because his instinct is to get out of that box," Biffle said. "Cesar worked with him a little bit, and now you could walk up to the cage and the dog would quit being aggressive. It was totally amazing."

Millan also stopped by the motorhome of NASCAR driver Kevin Harvick and his wife, DeLana, to help get their snapping Chihuahua, Lo, in line before they welcome their first child.

"A lot of Millan's technique is watching how the dog stands and how the dog uses their tail," Biffle said. "It's something about the attitude and demeanor of the animal to figure out what the dog is thinking. Cesar doesn't really teach dogs. He teaches people."

And that's what Biffle is hoping to do with his foundation, which has awarded grants to more than 400 humane societies and animal shelters. He wants people to spend more thought when adopting pets and more thought in caring for animals.

"After hearing about cruelty cases, homeless dogs and all the euthanized pets, we had to do something," Biffle said. "These dogs are part of our family. I really think that people who look out for animals are good people for our society."