Is Ochratoxin A safe for dogs and cats?
High risk for petsDogs are highly sensitive to OTA — more sensitive than rats or pigs. OTA is a well-documented contaminant of commercially produced dry dog food (kibble made with low-quality grain or cereal byproducts). Canine OTA toxicosis produces acute nephrotoxicity (proximal tubular necrosis), anorexia, weight loss, polyuria/polydipsia, and immunosuppression. Several commercial pet food recalls have been triggered by elevated OTA levels. Chronic low-level dietary exposure may cause progressive renal disease without acute clinical signs. ASPCA and veterinary toxicologists consider OTA a significant but underrecognized pet food hazard.
What is ochratoxin a?
The IUPAC name is (2S)-2-[[(3R)-5-chloro-8-hydroxy-3-methyl-1-oxo-3,4-dihydroisochromene-7-carbonyl]amino]-3-phenylpropanoic acid.
Also known as: (2S)-2-[[(3R)-5-chloro-8-hydroxy-3-methyl-1-oxo-3,4-dihydroisochromene-7-carbonyl]amino]-3-phenylpropanoic acid, Antibiotic 9663, NCI-C56586, Phenylalanine-ochratoxin A.
- IUPAC name
- (2S)-2-[[(3R)-5-chloro-8-hydroxy-3-methyl-1-oxo-3,4-dihydroisochromene-7-carbonyl]amino]-3-phenylpropanoic acid
- CAS number
- 303-47-9
- Molecular formula
- C20H18ClNO6
- Molecular weight
- 403.8 g/mol
- SMILES
- CC1CC2=C(C=C(C(=C2C(=O)O1)O)C(=O)NC(CC3=CC=CC=C3)C(=O)O)Cl
- PubChem CID
- 442530
Risk for dogs
High riskDogs are highly sensitive to OTA — more sensitive than rats or pigs. OTA is a well-documented contaminant of commercially produced dry dog food (kibble made with low-quality grain or cereal byproducts). Canine OTA toxicosis produces acute nephrotoxicity (proximal tubular necrosis), anorexia, weight loss, polyuria/polydipsia, and immunosuppression. Several commercial pet food recalls have been triggered by elevated OTA levels. Chronic low-level dietary exposure may cause progressive renal disease without acute clinical signs. ASPCA and veterinary toxicologists consider OTA a significant but underrecognized pet food hazard.
Risk for cats
High riskCats are also sensitive to OTA-induced nephrotoxicity, which is particularly important given that cats are predisposed to chronic kidney disease (CKD) generally. Contaminated dry cat food is the primary exposure route. OTA's long plasma half-life in mammals (mean 35 days in some species) allows bioaccumulation with repeated dietary exposure. Clinical signs in cats mirror those in dogs: renal dysfunction, weight loss, immunosuppression. The combination of OTA exposure and breed/age-related CKD susceptibility in cats makes this mycotoxin a clinically underappreciated hazard. Store pet food in cool, dry conditions; OTA increases with improper storage of grain-based products.
Regulatory consensus
6 regulatory and scientific bodies have classified Ochratoxin A. The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| IARC | 1993 | Group 2B (possibly carcinogenic to humans) | IARC Monograph 56 (1993). Sufficient evidence of carcinogenicity in experimental animals (renal cell tumors in rats and mice); limited evidence in humans. Associated epidemiologically with Balkan endemic nephropathy (BEN) and upper urinary tract urothelial carcinoma in endemic areas of Croatia, Bosnia, Bulgaria, Romania, and Serbia. |
| EPA CTX / NTP RoC | — | Reasonably Anticipated to be a Human Carcinogen | |
| EPA CTX / IARC | — | Group 2B - Possibly carcinogenic to humans | |
| EPA CTX / CalEPA | — | Known human carcinogen | |
| EPA CTX / Genetox | — | Genotoxicity: negative (Ames: negative, 0 positive / 2 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: negative (Ames: negative, 0 positive / 2 negative reports) |
Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.
Where pets encounter ochratoxin a
- Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
- Occupational Environments — Factories, Warehouses, Transportation vehicles
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Ochratoxin A:
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Prevention (storage and agricultural practices)
Trade-offs: Zero point-of-use emissions; shifts emissions to power generation (grid-dependent); lower operating cost; higher capital cost; infrastructure requirements (charging, grid capacity); rapidly improving economics.Relative cost: 1.2-2×
Frequently asked questions
Is ochratoxin a safe for pets?
Dogs are highly sensitive to OTA — more sensitive than rats or pigs. OTA is a well-documented contaminant of commercially produced dry dog food (kibble made with low-quality grain or cereal byproducts). Canine OTA toxicosis produces acute nephrotoxicity (proximal tubular necrosis), anorexia, weight loss, polyuria/polydipsia, and immunosuppression. Several commercial pet food recalls have been triggered by elevated OTA levels. Chronic low-level dietary exposure may cause progressive renal disease without acute clinical signs. ASPCA and veterinary toxicologists consider OTA a significant but underrecognized pet food hazard.
What products contain ochratoxin a?
Ochratoxin A appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).
Why do regulators disagree about ochratoxin a?
Ochratoxin A has been classified by 6 agencies including IARC, EPA CTX / NTP RoC, EPA CTX / IARC, EPA CTX / CalEPA, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.
See Ochratoxin A in the pets app
Look up products containing ochratoxin a, compare to alternatives, and explore the full data record.
Open in pets View raw API dataSources (4)
- IARC Monographs Volume 56: Ochratoxin A (1993) — regulatory
- EFSA Panel on Contaminants: Risks to Human Health Related to Ochratoxin A in Food (Scientific Opinion) (2020) — regulatory
- WHO Safety Evaluation of Certain Mycotoxins in Food: Ochratoxin A (2001) — regulatory
- ASPCA Animal Poison Control Center: Mycotoxin Toxicosis in Companion Animals (2021) — report
Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →