Texas A&M links ractopamine exposure to heart damage in dogs

Ractopamine, a feed additive used to promote lean muscle growth in cattle, pigs, and turkeys, is drawing fresh scrutiny from small-animal clinicians after Texas A&M researchers reported what they describe as the first published cases of natural ractopamine exposure in dogs. In a May 5, 2026, Texas A&M announcement tied to a March 2026 case report in Veterinary Record Case Reports, the team detailed two farm dogs that developed muscle tremors, ventricular arrhythmias, hypokalemia, and sharply elevated cardiac troponin I after ingesting ractopamine-containing feed. One dog survived without long-term effects after early decontamination, while the other died, underscoring how quickly exposure can progress to severe myocardial injury. (vetmed.tamu.edu)

Why it matters: For veterinary professionals, the report adds a new real-world differential for dogs presenting with tremors plus tachyarrhythmias in agricultural settings. The authors said natural exposure in dogs had not previously been described in the veterinary literature, even though earlier experimental work in greyhounds showed that a single oral dose of ractopamine could trigger arrhythmias, elevated troponins, myocardial necrosis, and vascular injury. That makes history-taking around livestock feed access, early decontamination, electrolyte monitoring, ECG surveillance, and cardiac biomarker testing especially relevant when rural or mixed-practice teams see unexplained acute cardiotoxicity. (vetmed.tamu.edu)

What to watch: Expect this case report to raise awareness among emergency, toxicology, and rural practitioners, and potentially prompt more reporting of suspected feed-related cardiotoxic exposures in dogs. (vetmed.tamu.edu)