David Duffield , the retired founder of software maker PeopleSoft, and his wife bought a miniature schnauzer from a breeder in 1986.

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The yard, though only about 500 square feet, opened from the kitchen and was a perfect space for their dog, Silenzio, a Chihuahua and miniature Schnauzer mix.

WSJ: One Duplex, Three Renovations | Balance Sheet