Little: Piebald 
3 
PIEBALD COAT PATTERNS 
Coat patterns, such as these, characterize 
several varieties of dogs, but similar 
spotting is occasionally found among 
breeds that are normally solid colored. 
Study of these cases indicates that such 
spotting is hereditary. Nos. 1 and 2 above 
represent Airedale terriers, and No. 3 a 
Scottish terrier puppy. (Fig. 3.) 
Spotting in Dogs 13 
may arise from a self race, by mutation, 
without passing through a series of 
minute gradations directed by selection. 
The first case to be reviewed is that 
of a spotted Scottish terrier puppy 
(Fig. 3, No. 3) born in my father’s 
kennels, January 22,1909. This puppy, 
a bitch, was the only individual born 
in the first litter obtained from two 
young solid-colored, pedigreed, and 
registered Scottish terriers, neither of 
which had been out of the kennels 
from the time at which they became 
sexually mature. The spotted puppy 
in question was born dead, a fact not 
very suprising in view of the litter 
being the first produced by the bitch. 
The two parents are far from closely 
related as a glance at the pedigree 
(Table I) will show. If the spotted 
coat of the exceptional puppy is hy- 
postatic to solid colored coat, it may be 
considered as introduced by the germ 
cells of both parents either by parallel 
mutations occurring in each of them, or 
by being contributed to each of them 
by a common ancestor. If the idea of 
the occurrence of parallel mutations on 
cach side of the pedigree is considered 
as far fetched, we must look on both 
sides of its pedigree for an ancestor or 
ancestors in common. In this connec- 
tion, Balmacron Prince occurring in the 
fourth generation on the male side and 
in the third generation on the female 
side appears to be the only possibility. 
If this dog was, in respect to hypostatic 
piebald spotting, DR in formula, he 
might well have introduced this spotting 
into the cross. The result would have 
been that, after several generations, the 
proper DRx DR mating would have 
been made, and an RR or spotted 
individual would have resulted. 
The fact of particular interest from the 
wewpoint of the origin of spotting is 
that the puppy had white areas of con- 
siderable extent and could in no way be 
considered a product of selection of 
minute variations possessed by lightly 
spotted ancestors. 
The second case presents even more 
interesting features. It deals with the 
appearance of spotted individuals in 
two litters of Airedale terriers. The 
