What a Pedigree Actually Tells You

A pedigree is a documented family tree -- typically showing three to five generations of a dog's ancestors. At the most basic level, it tells you who a dog's parents, grandparents, and great-grandparents were. But for a breeder working deliberately, it tells you much more than that.

A well-researched pedigree tells you:

People who treat pedigrees as paperwork are missing most of the point. The pedigree is a tool. For a breeder who knows how to use it, it is one of the most powerful tools in the entire breeding program.

Reading Bloodline Patterns

The most important thing to do when you first look at a pedigree is read it for patterns, not just individual names. Look for which names appear more than once. Look at which side of the pedigree -- sire's side or dam's side -- those repeated names come from. Look at how far back the repeats appear.

A dog who appears on both the sire's side and the dam's side of a pedigree is being line-bred on. If that dog appears in the third or fourth generation on both sides, the line breeding is moderate -- what breeders sometimes call a 4-4 or 3-4 cross. If the same dog appears twice in the third generation, that is a tighter 3-3 line breeding, concentrating their genetics more strongly.

Neither of these is automatically good or bad. What matters is whether the ancestor being concentrated on was a positive contributor to the breed -- healthy, correct in type, with a good temperament track record. Line breeding on a great dog can fix his best characteristics reliably in offspring. Line breeding on a dog who carried health problems concentrates those problems as well.

Identifying Johnson vs Scott Type in a Pedigree

For American Bulldog breeders, understanding the type composition of a pedigree is a practical necessity. Most modern ABs are not pure Johnson or pure Scott -- they carry varying degrees of both. Knowing the type balance in your dog's pedigree, and in a potential mate's pedigree, helps you predict what a breeding is likely to produce.

Reading for Johnson Influence

Johnson-line dogs are identifiable in pedigrees by the presence of Johnson's kennel prefix and well-known Johnson foundation names. Dogs with predominantly Johnson-line ancestry will produce heavier, more massive puppies with broader skulls and more pronounced underjaw. If you are breeding toward the Classic/Bully type, you want to see strong Johnson-line representation on both sides.

Reading for Scott Influence

Scott-line dogs appear with the Scott prefix and the Standard-type foundation names. Heavy Scott-line ancestry produces leaner, faster, longer-muzzled dogs. If you are breeding toward the Standard/Performance type for working or sport purposes, balanced Scott-line representation is what you are looking for.

Breeding Across Types

Many excellent American Bulldogs come from deliberate crosses between Johnson and Scott lines. These crosses often produce dogs that combine characteristics of both types -- more athletic than a heavy Johnson, but with more substance and presence than a lean Scott. Understanding the type balance in both parents' pedigrees lets you predict approximately where a cross is likely to land on the type spectrum.

Using Pedigrees for Breeding Decisions

Here is a practical workflow for using the ABRA pedigree database in your breeding planning:

Step 1: Know Your Female's Pedigree in Depth

Before you research stud dogs, know your own dog's pedigree thoroughly. What bloodlines are strongest? What type is she? What do you know about the health of her ancestors? What are her strengths and what would you like to improve in her offspring? Write this down -- it focuses your research.

Step 2: Research Potential Stud Dogs

Search the ABRA archive for stud dogs that complement your female. This means dogs whose type strengths address her areas for improvement, whose bloodlines work with hers without creating excessive line breeding, and whose health data is clean. Look at their registered offspring if any are in the database -- actual offspring tell you more than pedigree predictions.

Step 3: Check for Shared Ancestry

Before finalizing a pairing, pull up both the stud's and dam's pedigrees and look for shared ancestors. A small degree of shared ancestry is normal -- in a breed with a limited post-revival population, every American Bulldog shares some common ancestors. But knowing which ancestors are shared, and how frequently they appear, lets you make an informed decision about the COI of the pairing and whether the line breeding being created is intentional and desirable.

Step 4: Cross-Reference Health Data

Check the health data available in the archive for ancestors in both pedigrees. OFA hip and elbow results, NCL and ichthyosis testing, and any other health records on file are visible in the database. A stud dog whose sire had OFA Fair hips, whose grandsire had OFA Mild dysplasia, and whose great-grandsire is unscreened is a different picture than a stud whose entire four-generation pedigree shows OFA Good or Excellent results. That difference matters when you are making breeding decisions.

Understanding COI -- Coefficient of Inbreeding

The coefficient of inbreeding (COI) is a number that estimates how genetically related a pair of dogs is, expressed as a percentage. A COI of 0% would mean no shared ancestors at all -- impossible in any breed with a defined foundation. A COI of 25% would be the result of parent-offspring or full sibling breeding.

Most responsible breeders aim to keep COI below approximately 6.25% -- the equivalent of a first-cousin pairing. The ABRA pedigree database calculates COI for registered dogs, giving breeders a concrete number to work with when planning pairings.

COI is a tool, not a rule. A pairing with a 7% COI on the right ancestor -- one who was healthy, typey, and produced outstanding offspring -- is not automatically worse than a pairing with a 4% COI on mixed, undistinguished ancestry. But COI gives you a baseline understanding of how much genetic concentration is happening in a given pairing, and that baseline is important context for every other decision you make.

How pedigreedatabase.ca Makes Pedigree Research Easy

The ABRA pedigree database at pedigreedatabase.ca was built specifically to serve American Bulldog breeders and enthusiasts. With 12,000-plus registered dogs, it is the most comprehensive American Bulldog pedigree archive in existence.

Key features for breeders:

ABRA has been maintaining this archive since 1998, co-owned by Lance and Lesli Rose since 2005. The goal has always been to give the American Bulldog community the documentation tools it needs to breed responsibly and preserve the breed's history.

Building Your Breeding Program with Pedigree Knowledge

A breeding program is a long-term project. The decisions you make today in a single litter are small steps in a larger direction. Pedigree knowledge lets you be intentional about that direction rather than reactive to whatever stud dog is available or whoever you happened to meet at a show.

Breeders who use pedigrees well think in generations. They know what they want their line to look like in five or ten years, they understand which bloodlines support that vision and which do not, and they make pairing decisions that consistently move their program toward their goal rather than lurching randomly from litter to litter.

That kind of intentional, long-term approach to breeding is exactly what the founders of the breed -- Johnson, Scott, and the other early preservationists -- practiced. It is why the dogs they produced had such a lasting impact. The tools available to breeders today are dramatically better than what those early breeders had. A comprehensive online archive, COI calculations, DNA health testing -- these are tools they did not have. The responsibility that comes with having better tools is to use them.

Search the ABRA Archive and start your pedigree research today →

Frequently Asked Questions

What does an American Bulldog pedigree tell you?
A pedigree is a documented record of a dog's ancestry -- typically going back three to five generations. For American Bulldogs, a pedigree shows which bloodlines are present, whether the parents or grandparents were health tested, whether there is line breeding (the same dogs appearing on both sides), and which type -- Johnson, Scott, or mixed -- the dog's ancestry leans toward.
What is line breeding and is it good or bad for American Bulldogs?
Line breeding means breeding dogs that share common ancestors -- intentionally using a specific dog or dogs across multiple generations to concentrate their genetics. It is a standard tool in responsible breeding used to fix desirable traits. It becomes problematic when it is done without health testing, because it can also concentrate genetic problems. Line breeding done thoughtfully by health-testing breeders is a legitimate tool; line breeding done carelessly is how hereditary problems proliferate in a line.
How do I use pedigreedatabase.ca for breeding research?
Search by registered name to find any dog in the archive. From a dog's profile you can view their pedigree, see their offspring, check health data on file, and trace ancestry back through multiple generations. For breeding planning, you can look up potential stud dogs, see how their pedigree complements your female's, identify any shared ancestors that would create line breeding, and check available health test results.
What is coefficient of inbreeding (COI) and why does it matter?
COI is a calculation that estimates the degree of genetic relatedness in a given pairing. A higher COI means the offspring are more likely to inherit the same genes from both parents -- which increases consistency but also increases the risk of recessive genetic conditions expressing. Most responsible breeders aim to keep COI below 6.25% (equivalent to first cousins), and the ABRA database provides COI calculations to help breeders make informed decisions.