If an incredible dog appears multiple times in a pedigree, are you really “locking in” the traits that made that dog great?
Not exactly.
In Part 3 of our Wellness Wednesday series, The Genetics of a Performance Dog, we’re diving into one of the most debated topics in dog breeding: linebreeding, inbreeding, COI, and genetic diversity.
Breeders have used linebreeding for generations to create consistency and preserve desirable characteristics within a family of dogs. But there’s an important catch:
Genetics don’t know which traits you wanted doubled.
In this episode, we break down:
What linebreeding actually means genetically
Linebreeding vs. closer forms of inbreeding
Homozygosity and why it can increase predictability
Why recessive traits can emerge when related dogs are bred
What coefficient of inbreeding—or COI—actually tells us
Why pedigree depth matters when comparing COI numbers
Pedigree COI vs. genomic measures of inbreeding
Why a low COI doesn’t automatically mean a better or healthier breeding
Inbreeding depression and long-term population health
The popular-sire effect and how successful performance dogs can dramatically influence a gene pool
Why outcrossing isn’t automatically the answer
The constant balancing act between consistency and genetic diversity
We’ll also talk about why linebreeding itself shouldn’t automatically be labeled “good” or “bad.” It’s a breeding strategy—and understanding the family behind the pedigree matters just as much as the number attached to it.
Because when you linebreed on an exceptional dog, you don’t get to select only the drive, marking ability, structure, trainability, or temperament you loved.
You’re concentrating the genetic package—not just the traits you can see.
🎙️ Part 3 of The Genetics of a Performance Dog challenges us to stop breeding pedigrees and numbers in isolation and start asking a better question:
What are we concentrating—and do we understand the family well enough to justify it?
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