What does responsible British Bulldog breeding require in practice?

ADAMTS3 testing of all breeding dogs from cord tissue collected at birth, confirmed by an accredited veterinary genetics laboratory. Pairing decisions made on the basis of those copy numbers. Specialist reproductive management of the caesarean — the moment when cord tissue can be collected. A structured developmental program run from birth through 8 weeks. MDBA registration and participation in the Breeding Brachys for Health program. Each of these produces a specific, verifiable record.

How do I know if a British Bulldog breeder is actually improving the breed?

A program improving the breed has ADAMTS3 copy numbers in its gene pool moving in a documented direction over time. The pedigrees show what each pairing was designed to achieve. The copy numbers of the offspring are on record. A program producing registered litters has MDBA papers. Both can show registration documentation. Only one can show a documented history of pairing decisions made on the basis of copy numbers — and the outcomes those decisions produced.

What is the MDBA Breeding Brachys for Health program?

The MDBA (Master Dog Breeders and Associates) Breeding Brachys for Health program is a formal health initiative for brachycephalic breeds, introduced in 2020. For British Bulldogs, it requires mandatory ADAMTS3 testing for all breeding dogs — litters cannot be registered without documented parent status. The program tracks pedigrees, monitors genetic diversity, and works toward a gene pool with more dogs carrying zero copies of the ADAMTS3 risk variant, without removing carriers from breeding entirely. Hollywood Bulldogs AUS is MDBA registered (Member #18715) and participates in the program.

What does genetic diversity mean for British Bulldog breeding?

Genetic diversity in British Bulldog breeding means keeping the gene pool broad while increasing the proportion of dogs carrying fewer copies of the ADAMTS3 risk variant. The MDBA's Breeding Brachys for Health program uses an open stud book, accepting dogs from other registries including those carrying two copies, and works toward maximum zero-copy dogs who do not share a common ancestor in at least four generations. Diversity and health improvement are the same objective — not a trade-off.

Can I use a 0-copy ADAMTS3 stud if my female carries one or two copies?

Yes. A zero-copy dog mated with any dog, regardless of copy number, produces no puppies affected by ADAMTS3-driven airway oedema. A 0-copy stud paired with a 1-copy female produces offspring that are either 0-copy or 1-copy. A 0-copy stud paired with a 2-copy female produces offspring that are all 1-copy. In both cases, no affected puppies are produced. This is what makes accessible 0-copy studs a practical mechanism for program-level change in one litter.

How do I start building a responsible British Bulldog breeding program in Australia?

Start with ADAMTS3 testing of your existing breeding dogs. Register with the MDBA and participate in the Breeding Brachys for Health program. Make your first pairing decision on the basis of known copy numbers — and document the outcome. Access to 0-copy studs with fresh, chilled, and frozen semen is available Australia-wide through programs like Hollywood Bulldogs AUS. One documented pairing decision is the start of a program.

What documentation should a responsible British Bulldog breeder provide?

MDBA registration papers for the parents and the puppy, microchipping, age-appropriate vaccinations, worming, and a veterinary health check. What distinguishes programs building toward something is ADAMTS3 copy number documentation — confirmed by an accredited veterinary genetics laboratory from cord tissue collected at birth — for both parents and the puppy. For breeders buying on main register or accessing semen: copy number results for the stud and a documented record of what the program's pairings have produced over time.

Is it possible to breed British Bulldogs that breathe better?

Yes. ADAMTS3 copy number is the genetic variable most associated with airway oedema in British Bulldogs — and it is testable and heritable. A zero-copy dog mated with any dog produces no affected offspring. A program that consistently uses 0-copy or 1-copy dogs in pairings moves the gene pool in a documented direction over time. Dogs with zero copies have normal tracheas and have not suffered the health ailments associated with oedema. The results are documented. The genetics exist. The decision is in the pairing.

What Makes a Responsible British Bulldog Breeder in Australia

Covers what responsible British Bulldog breeding requires in practice, how to distinguish a program that is improving the breed from one that is producing registered litters, the role of genetic diversity, and how to build or access a program built on documented copy number strategy — for puppy buyers and breeders.

By Hollywood Bulldogs AUSUpdated 29 June 202613 min read

British Bulldog puppy from a documented, health-tested Australian breeding program

What makes a responsible British Bulldog breeder?

A responsible British Bulldog breeder in Australia is one whose breeding decisions are documented, traceable, and aimed at improving the breed. The MDBA (Master Dog Breeders and Associates) Breeding Brachys for Health program is the formal framework for this: mandatory ADAMTS3 testing for all British Bulldog breeding dogs since 2020, pedigree tracking, and coordinated work toward a gene pool with a greater proportion of dogs carrying zero copies of the ADAMTS3 risk variant. What the breed your puppy came from — or the program you are building — is doing to the gene pool is either visible in the documentation, or it is not.

The MDBA (Master Dog Breeders and Associates) introduced mandatory ADAMTS3 testing for British Bulldog breeding dogs in 2020. Litter registration requires documented parent status for both dogs. A breeder operating within this framework has a verifiable record of every breeding dog's ADAMTS3 status — the baseline for responsible practice in this breed.

What distinguishes programs that are building toward something is what happens within that framework. Whether copy numbers are moving in a direction. Whether pairings are planned around what those copy numbers produce in the next generation. Whether the gene pool is being monitored for diversity, not just for registration compliance.

Responsible breeding is not a description of intent. It is a description of what those litters did.

“Responsible breeding is not a description of intent — it is a description of what those litters did to the gene pool.”

What does responsible British Bulldog breeding actually require?

Responsible British Bulldog breeding requires ADAMTS3 testing of all breeding dogs, pairing decisions made on the basis of those copy numbers, specialist reproductive management that makes birth-collected cord tissue samples possible, and a structured developmental program from birth. Each of these has a specific, verifiable record. A program that invested in them can produce that record. A program that did not cannot — and the gap is visible in what is absent from the documentation of the puppy you are considering, or the program you are building.

ADAMTS3 was identified by Marchant et al (2019, PLOS Genetics) as an important airway oedema risk marker in British Bulldogs — the accumulation of fluid in soft tissue that further narrows a space already compressed by structure. . Copy number is inherited. What the parents carry helps inform the range of copy numbers the litter can produce.

The caesarean is not a routine procedure in this breed. It is the moment when cord tissue can be collected — when the ADAMTS3 sample that produces a birth-documented copy number is either gathered or not. A caesarean managed at a specialist reproductive facility produces documentation that a routine one does not. That documentation cannot be produced after the fact. The copy number of every puppy in that litter — including the one you are considering, or the ones your program produced — was settled at the moment of delivery.

A structured developmental program — age-appropriate stimulation and socialisation from birth through 8 weeks — produces a different puppy from one raised without it. Its effects appear in the dog. Its absence also does.

Each of these requirements produces a specific record. The record is what responsible breeding actually looks like.

How can I tell if a breeder is improving the breed or just producing puppies?

A breeding program that is improving the breed has ADAMTS3 copy numbers in its gene pool moving in a documented direction over time — fewer high-copy pairings, more zero-copy dogs available, traceable pedigrees that show what each pairing was designed to achieve. A program that is producing litters has registered puppies. Both can have MDBA papers. Only one has a documented program behind them.

MDBA registration for British Bulldogs has mandatory ADAMTS3 testing requirements built in. Every registered British Bulldog breeding dog has a documented ADAMTS3 status. That is the baseline — and it means the gap between registering litters and improving the breed is visible in the documentation.

A breeder who has participated in the Breeding Brachys for Health program long enough — and who made pairing decisions based on copy numbers — has documentation showing what those decisions produced over time. The copy numbers of the offspring. The pedigrees that show which dogs were paired and why. The direction the gene pool moved as a result — and where the puppy you are considering, or the breeding decisions you have made, sit within it.

A breeder producing registered litters has documentation that litters were registered. The record ends there.

“Producing registered litters and improving the breed are not the same thing — only one requires a documented program built around what the pairings were designed to achieve.”

What role does genetic diversity play in responsible British Bulldog breeding?

Genetic diversity is not in tension with health improvement in this breed — it is part of it. The MDBA's Breeding Brachys for Health program works toward a gene pool with more dogs carrying zero copies of the ADAMTS3 risk variant without removing carriers from breeding entirely. An open stud book, accepting dogs from other registries including those carrying two copies, keeps the gene pool broad while the proportion of low-copy dogs increases. The goal is not a gene pool without carriers. It is a gene pool where the decisions that produced the puppy you are considering — or the decisions you are making for your program — are documented and moving in one direction.

A zero-copy dog mated with any dog, regardless of copy number, produces no puppies affected by this condition. This is what makes 0-copy studs a practical mechanism for program-level change — they can be paired into any existing program and the offspring carry at most one copy. That is a meaningful shift in one litter, without restricting which females can be used.

The Breeding Brachys for Health program tracks pedigrees and monitors genetic diversity across the registered British Bulldog population. The goal is maximum zero-copy dogs who do not share a common ancestor in at least four generations. Diversity and health improvement are the same objective in this program — not competing priorities.

For breeders building a program over time, the question is not whether to use carriers in breeding. It is whether the copy numbers in your gene pool are moving in a documented direction — and whether you have the records to show what each pairing contributed to that movement.

The goal is not a gene pool of zero-copy dogs only — it is a gene pool where every pairing can be shown to have moved the numbers. That shift does not require removing carriers from your program. It requires one documented decision.

How do I build a responsible British Bulldog breeding program in Australia?

Start with ADAMTS3 testing of your existing breeding dogs. Understand what copy numbers you are working with. Register with the MDBA and participate in the Breeding Brachys for Health program. Your first documented pairing decision — made on the basis of known copy numbers — is the start of a program. One 0-copy stud paired with any female, regardless of her copy number, produces no affected puppies in that litter and creates a documented first step toward the gene pool you want to build.

The MDBA's Breeding Brachys for Health program provides the framework: mandatory testing, pedigree tracking, genetic diversity monitoring. Registration and participation place your breeding decisions within a coordinated effort — and give every pairing a traceable record.

ADAMTS3 testing is conducted from cord tissue collected at birth. The sample is collected at delivery — it cannot be gathered retrospectively. For breeders establishing a new litter, the testing process begins at the caesarean, not in a laboratory weeks later.

Hollywood Bulldogs AUS offers 0-copy ADAMTS3 studs with fresh, chilled, and frozen semen available Australia-wide. Current 0-copy studs include Rusty (Triple Carrier Blue Fawn) and Bluey (Triple Carrier Blue Tri), with Big Meech (Full Suit Black Tri) and Buddy (Lilac Tri) coming soon. All are 6-Panel Clinical Clear. Collection is performed by reproductive veterinary specialists. For breeders wanting to introduce documented 0-copy ADAMTS3 genetics into an existing line, a 0-copy sire cannot transmit an ADAMTS3 risk allele to the litter.

Hollywood Bulldogs AUS is MDBA registered (Member #18715) and participates in the Breeding Brachys for Health program. Every breeding adult is ADAMTS3-tested, with results confirmed by an accredited Australian veterinary genetics laboratory.

Professional veterinary services are engaged on a fee-for-service basis where required. Cord tissue is collected from each puppy at delivery.

Testing is conducted by Dog Breeding Science, an Australian veterinary genetics laboratory in Redfern, NSW. Samples never leave the country.

Every pairing at Hollywood Bulldogs AUS is decided by what it does for the breed. One litter at a time.

“One 0-copy stud paired with any female, regardless of her copy number, produces no affected puppies in that litter — and creates the documented first step toward the gene pool you want to build.”

Australia's first documented 1-copy female
Australia's second documented 1-copy male
Australia's first documented 0-copy British Bulldog males
Largest collection of ADAMTS3-tested 1-copy and 0-copy British Bulldogs in the world

Key Takeaways

Responsible British Bulldog breeding is defined by what pairings do to the gene pool over time — not by intent, self-description, or registration status alone
The MDBA's Breeding Brachys for Health program has required mandatory ADAMTS3 testing for all British Bulldog breeding dogs since 2020 — litters cannot be registered without documented parent status
A zero-copy stud paired with any female, regardless of her copy number, produces no affected puppies in that litter — making 0-copy studs a practical mechanism for program-level change
Genetic diversity and health improvement are the same objective in responsible British Bulldog breeding — the goal is more zero-copy dogs without shared ancestry, not a gene pool without carriers
A program improving the breed can show traceable pedigrees, documented copy numbers across generations, and pairing decisions made on the basis of what those copy numbers produce
Fresh, chilled, and frozen semen from ADAMTS3-tested 0-copy studs is available Australia-wide for breeders who want a documented first step toward a healthier gene pool

Hollywood Bulldogs AUS is MDBA registered (Member #18715) and participates in the Breeding Brachys for Health program. Fresh, chilled, and frozen semen from ADAMTS3-tested studs — including 0-copy males — available Australia-wide. Puppies available on limited and main register, with full ADAMTS3 documentation from birth. For buyers. For breeders building a program on the same foundation.

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Frequently Asked Questions

About Hollywood Bulldogs AUS

Hollywood Bulldogs AUS is an MDBA-registered British Bulldog breeding program focused on evidence-led health selection, ADAMTS3 testing and transparent owner education. Educational content does not replace individual veterinary advice.

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