Silver Streak

Next door to me, there lives a dog named Silver. I don't actually see Silver all that much, but I can infer her existence from the loud barking behind the hedge that stops when I say "hey Silver!" in a very chipper voice. Sometimes I catch a flash of tail or muzzle, enough to know that she is very large and very furry. And very dark brown, which leaves the name "Silver" as a bit of a mystery.