Most of the puppies are some combination of black and brown, and one is brindled.
From the post-gazette.com
Tigress brindled with aspen, Jaguar-splashed, puma-yellow, leopard-livid slopes of America.
From the guardian.co.uk
Acting on a complaint received from a member of the public, Boy, a brindled bull terrier cross, was found chained to a kennel.
From the nzherald.co.nz
In the first condition, the glass and the green-bronze glaze on the ceramic dissolves into sylvan reflections and brindled brushstrokes of shadow and soft, dark colours.
From the independent.co.uk
More examples
Having a grey or brown streak or a pattern or a patchy coloring; used especially of the patterned fur of cats
Brindle is a coat coloring pattern in animals, particularly dogs, cats, cattle, crested geckos and, rarely, horses. It is sometimes described as "tiger striped", although the brindle pattern is more subtle than that of a tiger's coat. ...
Of a brownish, tawny or gray colour, with streaks or spots; streaky, spotted
(BRINDLING) The appearance of striping on the fur.