That's the focus of an episode of "Dog Whisperer" on the National Geographic Channel.
Wentz and Ashlee Simpson had hoped getting Hemingway a dog friend would help. However, when they got a bulldog puppy named Rigby, Hemingway got aggressive.
The episode focuses on Dog Whisperer Cesar coming into their home to make it safe for the newborn. The episode airs Dec. 28.
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