American Staffordshire Terrier
American Staffordshire Terriers have a cited life expectancy of 12.5 years (McMillan 2024 / VetCompass, n=142, 95% CI 11.4 to 13.1). The most carried tested variant is Cone-Rod Dystrophy, in 18% of 42,684 American Staffordshire Terriers tested (Donner 2023), then Degenerative Myelopathy (6.4%) and Hyperuricosuria (6.3%). Only 11 dogs stand behind the atlas figures here, so little is known yet.
Also known as AmStaff and Staffordshire, American Terrier.
What genetic diseases do American Staffordshire Terriers carry?
From a panel of 250 Mendelian-disease variants screened in 1,054,293 dogs (Donner et al. 2023), American Staffordshire Terriers carry 71 of them at observable frequency. Carrier frequency is not clinical risk. Most recessive variants require two copies for disease expression; many dominant variants show incomplete penetrance. Read this as a population fingerprint of what's in the gene pool, not a per-dog prediction.
RPGRIP1what this gene does
RPGRIP1 is a gene involved in the function of photoreceptor cells in the eye, which help dogs see in different light conditions.
For your dog: If your dog belongs to a breed known to carry RPGRIP1 mutations, it’s worth discussing with your vet to understand the risks and monitor eye health.
FGF4what this gene does
FGF4 influences leg length by affecting bone growth, leading to shorter legs in certain breeds.
For your dog: If your dog is from a breed known to carry this gene, it's worth discussing spinal health with your vet, but being a carrier doesn’t guarantee problems.
SOD1what this gene does
SOD1 is a gene that helps protect cells from damage caused by harmful molecules called free radicals.
For your dog: If your dog is a carrier of SOD1 variants, it's worth discussing with your vet, but remember carrier status doesn't mean your dog will get the disease.
SLC2A9what this gene does
SLC2A9 is a gene that helps regulate uric acid levels in a dog's body. It plays a role in how the kidneys handle this substance.
For your dog: If your dog is one of the breeds known to carry this gene variant, it’s worth discussing with your vet to understand any potential urinary health concerns.
SLC3A1what this gene does
SLC3A1 is a gene that helps transport certain amino acids in the kidneys. It plays a key role in preventing the buildup of cystine, which can form stones.
For your dog: If your dog is from a breed known to carry SLC3A1 variants, it’s worth discussing cystinuria risks with your vet, especially if urinary issues arise.
ARSGwhat this gene does
ARSG is a gene that helps break down certain molecules in the body, keeping cells healthy.
For your dog: If your dog is from a breed known to carry ARSG mutations, it's worth discussing genetic testing with your vet to understand potential health risks.
SLC7A9what this gene does
SLC7A9 is a gene that helps transport certain amino acids in the kidneys. It plays a role in how the body handles cystine, an amino acid that can form crystals.
For your dog: If your dog is a carrier, it’s worth discussing with your vet to monitor urinary health and catch any issues early.
PDE6Bwhat this gene does
PDE6B is a gene that helps control how the eye processes light signals, crucial for normal vision.
For your dog: If your dog is from a breed known to carry PDE6B mutations, it's worth discussing vision health with your vet, especially if you notice any changes in sight.
BEST1what this gene does
BEST1 is a gene that helps maintain the health of the retina, the light-sensitive layer at the back of the eye. It plays a role in keeping the cells in the retina functioning properly.
For your dog: If your dog is from a breed known to carry BEST1 variants, it’s worth discussing retinal health with your vet, especially if you notice any vision changes.
NPHS1what this gene does
NPHS1 is a gene important for kidney function, helping to keep proteins in the blood where they belong.
For your dog: If your dog’s breed is on the list, it’s worth asking your vet about NPHS1 to understand any risks and keep an eye on kidney health.
PRCDwhat this gene does
PRCD is a gene involved in the health of a dog's retina, the part of the eye that detects light and helps with vision.
For your dog: If your dog belongs to a breed known to carry PRCD changes, it's worth discussing eye health and potential genetic testing with your vet.
PDK4what this gene does
PDK4 helps regulate how cells use energy, especially in the heart muscle.
For your dog: If your dog is one of the breeds known to carry this gene, it’s worth discussing heart health with your vet, but being a carrier doesn’t mean your dog will develop disease.
NHEJ1what this gene does
NHEJ1 is a gene involved in repairing breaks in DNA, helping maintain the integrity of genetic information in cells.
For your dog: If your dog belongs to one of the breeds known to carry this gene variant, it's worth discussing testing with your vet to understand any potential eye health risks.
CHRNEwhat this gene does
CHRNE is a gene involved in the communication between nerves and muscles, helping muscles respond properly to signals.
For your dog: If your dog is from a breed known to carry CHRNE variants, it's worth discussing with your vet, especially if you notice muscle weakness or unusual fatigue.
SLC37A2what this gene does
SLC37A2 is a gene involved in how cells manage certain sugar molecules, which can affect bone development.
For your dog: If your dog is from a breed known to carry this gene variant, it's worth discussing with your vet, especially if you notice jaw discomfort or eating issues.
ABCB1what this gene does
ABCB1 is a gene that helps control how certain drugs are processed and cleared from a dog's body.
For your dog: If your dog is from a breed that carries this gene variant, ask your vet about medication sensitivities before giving any new drugs.
MTBPwhat this gene does
MTBP is a gene involved in regulating inflammation in the body. It helps control how the immune system responds to triggers.
For your dog: If your dog is from a breed known to carry MTBP variants, it's worth discussing with your vet whether genetic testing or monitoring for inflammation-related issues makes sense.
Show the other 51, ordered after these by severity, then carrier frequency.
What these results mean for a American Staffordshire Terrier
1.7% of American Staffordshire Terriers in the Donner 2023 cohort carried it (n=42,562).
- Two extra copies of a growth gene, FGF4, shape dog legs and spines. The one on chromosome 12 is the one tied to disc disease; the one on chromosome 18 shortens legs.
OMIA 000157-9615
“Two FGF4 retrogenes (FGF4L1 on chromosome 18 and FGF4L2 on chromosome 12) have been identified to cause dwarfism across many dog breeds.” OMIA 000157-9615
“Brown et al. (2017) reported that an FGF4 retrogene insertion in chromosome CFA12” OMIA 000157-9615
- Carrying it raises risk. It does not say which dog will have a disc problem. In Dachshunds researchers found the test is not a valid risk indicator on its own.
OMIA 000157-9615
“the FGF4 retrogene insertion on CFA12 is not a valid risk indicator on its own” OMIA 000157-9615
What to do
Ask your veterinarian what a carrier result changes for your dog. What lowers risk in a carrier is not established in the sources this page draws on.
No test, or a mix
Without a test nobody can say whether a dog carries it. Leg length alone does not tell you: the disc-disease copy and the short-leg copy are different insertions.
6.4% of American Staffordshire Terriers in the Donner 2023 cohort carried it (n=42,790).
- DM is a loss of function in the spinal cord that begins in adulthood and progresses to paralysis of the back legs. There is no treatment that stops it.
OMIA 000263-9615
“This is an adult onset degeneration of the spinal cord that progresses to paraplegia and tetraparesis. There is no successful treatment. A genetic test is available.” OMIA 000263-9615
- Two copies of the SOD1 variant mean at risk, not affected. Some dogs with two copies never show signs.
OMIA 000263-9615
“some homozygous mutant dogs had no signs of degenerative myelopathy, which suggests incomplete penetrance or other causative loci” OMIA 000263-9615
- One copy makes a dog a carrier. In the study that found the variant, every affected dog tested had two copies.
OMIA 000263-9615
“All affected dogs tested were homozygous mutant.” OMIA 000263-9615
What to do
A DNA result is not a diagnosis. Take the result, and any change in how the dog walks, to a veterinarian.
No test, or a mix
Without a test nobody can say how many copies a dog has. A breed's carrier frequency describes the breed, not this dog.
3.6% of American Staffordshire Terriers in the Donner 2023 cohort carried it (n=42,793).
- The kidneys fail to reclaim an amino acid called cystine, which can form crystals and stones in the urine and block the urinary tract.
OMIA 000256-9615
“Cystinuria, type 1 - A is an inherited defect that causes failure of reabsorption of cystine in the proximal renal tubule, leading to cystine precipitation in the urine. Formation of crystals and calculi lead to urolithiasis and urinary tract obstruction.” OMIA 000256-9615
What to do
Straining to urinate, or passing little or no urine, needs a veterinarian the same day.
No test, or a mix
Without a test nobody can say how many copies a dog has.
SLC7A9 p.A217T (sold as a cystinuria test)
Marker disputed2.9% of American Staffordshire Terriers in the Donner 2023 cohort carried it (n=42,793).
- The curated record finds no support for this variant causing cystinuria, and the researchers who studied it advise against using it as a test.
OMIA 001880-9615
“there appears to be no support for the variant to be causal” OMIA 001880-9615
“strongly recommend not to use "the variant in SLC7A9 as a test to predict the risk of developing cystinuria in male English bulldogs.” OMIA 001880-9615
What to do
A carrier result for this variant does not predict bladder stones. Straining to urinate or blood in the urine is a reason to see a veterinarian whatever a DNA test says.
No test, or a mix
The curated record gives no reason to test for this variant.
Other names
The American Staffordshire Terrier is also recorded as AmStaff and Staffordshire, American Terrier.
Identified as American Staffordshire Terrier (VBO:0200055) in the Vertebrate Breed Ontology (Mullen et al. 2025, CC-BY 4.0) · registry IDs FCI 286 · iDog 11 · VeNom 15079.
For researchers Population genetics, disease models and every recorded condition Open the research detail for the American Staffordshire Terrier
In the atlas, the American Staffordshire Terrier clusters consistently as American Staffordshire Terrier (100% of the 11 dogs here).
Only 11 dogs of this breed in the atlas, modestly sampled.
What the atlas genotypes say about American Staffordshire Terrier
Computed from the 14,478 CanVAS dogs in the Atlas, on an imputed genotype backbone: 77,215 directly typed sites per dog, imputed to 9.67 million variants.
The confidence below counts dogs, not reads: it is the size of the sample, and it is separate from how the genotypes were measured.
Not enough dogs in the atlas yet (n=11) for a reliable diversity figure. It fills in as more are added.
What does genetic diversity mean?
How varied a breed's gene pool is — the share of gene spots where a typical dog of the breed carries two different versions rather than two identical ones.
How to read it: Higher = more diverse. Among well-sampled breeds it ranges roughly 0.22 (least diverse) to 0.33 (most diverse).
Diversity is a strength, not a verdict on any individual dog. Lower diversity means it's worth paying attention to recessive-risk testing — not that a dog is doomed.
Not enough dogs in the atlas yet (n=11) to resolve cluster structure. It fills in as more are added.
What does within-breed variation mean?
How much individual dogs within the breed differ from each other genetically.
How to read it: Higher = more internal variety among individuals of the breed.
Sensitive to how many dogs of the breed we've sampled.
What does typical lifespan mean?
The median age dogs of the breed tend to reach.
How to read it: Higher = longer-lived. Compare to longevity-for-size to see whether it's just a size effect.
Drawn from population lifespan records; individual dogs vary widely with care, genetics, and luck.
American Staffordshire Terriers are a natural model for human disease
Because the same genes cause the same conditions across species, the inherited conditions documented in American Staffordshire Terriers help researchers understand, and work toward treating, the human diseases they model. This is the dog advancing human medicine. The breed models the human disease; it does not have it, and this is not a prediction for your dog.
- retinitis pigmentosa 40, modeled by the breed's Retinal atrophy - Cone-rod dystrophy 1 via PDE6B, the same underlying biology.
- OMIM:302030, modeled by the breed's Calvarial hyperostotic syndrome , the same underlying biology.
- Griscelli syndrome type 3, modeled by the breed's Coat colour, dilution, MLPH-related , the same underlying biology.
- OMIM:610008, modeled by the breed's Lysosomal storage disease, ARSG related , the same underlying biology.
- OMIM:254090, modeled by the breed's Muscular dystrophy, Ullrich type, COL6A3-related , the same underlying biology.
- exostoses, multiple, type 2, modeled by the breed's Osteochondromatosis, EXT2-related , the same underlying biology.
Every condition recorded in the American Staffordshire Terrier
Beyond the testable carriers above, OMIA's literature catalogue records 10 genetic conditions in the American Staffordshire Terrier, 10 of which have a known human equivalent. This is the documented landscape across all American Staffordshire Terriers ever studied, not a prediction for any one dog.
- Retinal atrophy - Cone-rod dystrophy 1 Autosomal recessiveHuman equivalent: retinitis pigmentosa 40
- Human equivalent: OMIM:302030
- Coat colour, dilution, MLPH-related Autosomal recessiveHuman equivalent: Griscelli syndrome type 3
- Lysosomal storage disease, ARSG related Autosomal recessiveHuman equivalent: OMIM:610008
- Human equivalent: OMIM:254090
- Osteochondromatosis, EXT2-related Autosomal dominantHuman equivalent: exostoses, multiple, type 2
- Polyneuropathy, generic Autosomal recessiveHuman equivalent: OMIM:601455
- Screw tail Autosomal recessiveHuman equivalent: OMIM:602151
- Urolithiasis Autosomal recessiveHuman equivalent: OMIM:220150
- XX difference of sexual development, generic MultifactorialHuman equivalent: 46,XX disorder of sex development
Where every number on this page came from.
This page draws on three primary data sources. Carrier frequencies for the Mendelian section come from Donner et al. 2023 (CC-BY-4.0). We grade these data at evidence Limited because the cohort is a direct-to-consumer ascertainment, which biases toward owners who chose to test their dogs. The panel also uses tag-SNP proxies for some variants rather than direct causal-variant assays. Limited is a study-design grade, not a quality grade: the Donner cohort is the largest open canine-genotype dataset in existence and we are grateful for it. We rate the confounding MEDIUM.
Population-genetic dimensions (heterozygosity, intra-breed PCA distance, nearest neighbors, trait-locus frequencies) come from CanVAS (Brundage 2026), harmonized through the Sniff Atlas. The exact release date and verification commit are pinned at the bottom of the page so a researcher can trace a number back to a specific snapshot. The disease-gene-variant graph comes from OMIA (Online Mendelian Inheritance in Animals; Nicholas, Tammen, and the Sydney Informatics Hub at the Sydney School of Veterinary Science, The University of Sydney; retrieved April 2026, DOI 10.25910/2AMR-PV70).
What this page does not yet have. Inheritance modes and per-disease penetrance evidence from Donner 2023 are in the structured data for every variant the panel covers. Mondo, OMIM, Ensembl, and HGNC cross-references live on the gene and disease pages this page links to, rather than being repeated here. What is still absent from this breed page is anything not in the cited panel, and each such gap carries its cause where it appears.
How to cite this page. The computed dimensions on this page are derived from the open Sniff Atlas v1.0.1 (Gehring 2026, doi:10.5281/zenodo.20566358, CC-BY 4.0). Full citation formats including BibTeX, RIS, and CITATION.cff at sniff.world/cite.
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- Donner J, Freyer J, Davison S, Anderson H, Blades M, Honkanen L, et al. (2023). Genetic prevalence and clinical relevance of canine Mendelian disease variants in over one million dogs. PLOS Genetics 19(2):e1010651. doi:10.1371/journal.pgen.1010651
- Brundage DM (2026). CanVAS: A Harmonized and Imputed Canine Variant Atlas. bioRxiv. doi:10.64898/2026.04.13.718238
- Nicholas, F.W., Tammen, I., & Sydney Informatics Hub. (2026). Online Mendelian Inheritance in Animals (OMIA) [dataset]. The University of Sydney. https://omia.org. doi:10.25910/2AMR-PV70 (retrieved April 2026).