This describes a dog which is fawn with a dark nose, non-dilute, black-masked, non-harlequin, brindled or not brindled, non-merle, and non-spotted. To allow for the rare exceptions we must include 'b' (brown mask and possible brown brindling), 'd' (blue mask and possible blue brindling), 'sp' (pied spotting), and perhaps 'a' (recessive black). The possible combination of homozygous brown and homozygous blue is a pale brown referred to as isabella in breeds where it is relatively common. J. W. Thompson's first stud dog, Hector, came from crossing a bitch, Juno, bought from animal dealer Bill George, to a dog, Tiger, owned by a Captain Fenton. Neither of these had any pedigree, as was normal for the period. Between 1830 and 1850 he bred the descendants of these dogs and some others to produce a line with the short, broad head and massive build he favoured.
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