PLUMMER TERRIER

Data are from a pedigree database supplied by Scott Robson that still needs to be edited for errors, so this information should be considered preliminary. Missing data or ID errors usually result in UNDERESTIMATES of inbreeding and kinship, so the numbers here (which are very high) should be considered to be more optimistic than the reality. 

1688 dogs total
665 dogs with recorded offspring
36 "founder" dogs

fe = 11.4
fg = 7.6
fa = 5.9

For the current population of dogs (approx generation 31 to present, about 2010-pres):
mean MK = 27%. If the dogs in the population were as closely related as full-siblings, this number would be 25%. Essentially any mating is the equivalent (or more) of a full sibling cross. (i.e., there are no "outcrosses").


9 ancestors account for all of the diversity in the breed; only 4 account for 77% (!!!).

Rollo W/C = 29%
Pip W/C = 22%
Vampire = 14%
Jenny = 12%

A decline in population size will create a bottleneck and increase the rate of inbreeding. The number of dogs per year in the database has fallen from about 40/yr to 10 or less. 

The average level of inbreeding in the breed is 25-30%, which is what you get from a full-sib cross from unrelated parents.

A few pedigree charts -

Pendragon Molly
top is the more recent generations (to the left), below are the founding dogs (to the right) (probably too small to read, though)

These pedigree charts clearly show the small number of founder dogs (on the right), several bottleneck generations (the "waists" in the middle of the charts), and recent inbreeding (on the left).