June 15, 2010 11:45 AM

Fitness trainer Bob Harper is known for helping out contestants on The Biggest Loser, but humans aren’t the only ones getting his TLC.

Meet Karl, Harper’s terrier-shi-tzu-possibly-Havanese mix. “I just rescued him a couple months ago,” Harper tells PEOPLEPets.com. “He is the best dog in the world. I love him!”

A friend of Harper’s had a connection to the nonprofit Animal Advocates Alliance, and it was through their rescue that Harper met Karl. “I tell people this all the time,” Harper says, “that I wasn’t even looking. I didn’t even want a dog, and all of a sudden I met this little one and he needed help. He was on the streets in Baldwin Hills, Calif., and I took him in and it’s been the best thing.”

When Harper brought Karl home, “I thought he was literally so medicated. He was so shut down and withdrawn. He’s about 2 years old, is what my vet said, and now he’s in good health, good shape and he’s running around and he’s the sweetest thing in the world.”

The new addition to the Harper household has friends’ tongues wagging. “I’m very type-A in my house, ” Harper admits. “Everything is very ordered, structured, but it was a good fit. Whenever he’s had accidents, I’m like, ‘You know what? It’s gonna happen.’ It always makes my friends laugh because they think I’m going to freak out!”

But as much as Harper works his Biggest Loser charges, he’s got to go a little easy on Karl. “I take him on walks all the time and that’s the extent of his exercise,” Harper says, “because his little legs get tired. He’s kind of like, ‘You know what? I’m ready to go back to the house!’ “

See more reality stars on PEOPLEPets.com:
‘Biggest Loser’ Trainer Jillian Michaels Unwinds with Horseback Rides and Dog Runs
Lauren Conrad’s Dog Chloe Likes to Chew Gum!

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