This is an introduction to breeding coefficient for the lay breeder as inbreeding is considered unacceptable by the uninformed. This will attempt to inform you to what inbreeding is, how it is used and how to calculate it.

Take the percentage of true relationships and divide by 2 than add the amount from each time that individual is found in the pedigree. This will give you a coefficient that is statistically the percentage of inbreeding(homzygousity).
 

Each parent = 50% divided by 2= 25% breeding coefficient.

Each grandparents = 25% divided by 2=12 1/2% breeding coefficient etc.

(This formula can be carried as far back in a
pedigree as you have pedigree to calculate) 

joe max=25%  mary puppy=37½% inbred coefficient max=12½% lilly=25% susy

This is a father/daughter cross, inbred coefficient is 37 1/2% to Max. He is the only dog that is considered in this demonstration.