Texas A&M report links ractopamine exposure to canine heart injury

A Texas A&M case report is putting a spotlight on an underrecognized farm-to-clinic hazard: ractopamine, a feed additive used to promote lean muscle growth in cattle, swine, and turkeys, may cause serious myocardial injury in dogs after accidental ingestion. In the report, published in Veterinary Record Case Reports, clinicians described two farm-setting dogs that presented with muscle tremors, ventricular arrhythmias, hypokalemia, and markedly elevated cardiac troponin after exposure. One dog survived after early decontamination and supportive care, while the other died after a delayed presentation, underscoring how quickly outcomes may diverge. Texas A&M researchers say this appears to be the first published description of natural ractopamine exposure in dogs in the veterinary literature. (vetmed.tamu.edu)

Why it matters: For veterinary professionals, the report adds a practical toxicology and cardiology alert, especially for rural and mixed-practice settings. The Texas A&M team said standard first-line antiarrhythmic treatment with lidocaine was not effective in these cases, while beta blockers better matched the drug’s mechanism of action, a point that could affect emergency decision-making. Because ractopamine remains FDA-approved for use in finishing pigs, beef cattle in confinement for slaughter, and finishing turkeys, veterinarians may need to add livestock feed exposure to the differential when dogs from agricultural properties present with tremors, ventricular tachycardia, or unexplained troponin elevation. (vetmed.tamu.edu)

What to watch: Watch for whether poison-control databases, continuing education, and farm safety messaging begin incorporating ractopamine-specific guidance for canine exposures. (vetmed.tamu.edu)