Sunny, a female Portuguese water dog, has joined Bo as "first pet." Take a look at photos of first pets dating back to the late 1800s.
Rex the King Charles cavalier spaniel rushes to greet President Ronald Reagan and first lady Nancy Reagan. The Reagans also had another dog, Lucky, a Bouvier des Flandres.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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