Terbutaline toxicosis in a dog.

A 2-year-old Collie-type dog with lethargy, tachycardia, tachypnea, and muscle tremors was examined 10 hours after the dog had bitten into an inhalation canister containing the beta 2-adrenergic agonist, terbutaline sulfate. Electrocardiographic findings (ventricular premature contractions and paroxysmal ventricular tachycardia) were consistent with excessive adrenergic activity resulting from terbutaline toxicosis. Serum terbutaline concentration was similar to that reported in human beings with terbutaline toxicosis. The dog did not respond to initial treatment with fluids and lidocaine administered IV, but rapid resolution of signs and conversion to normal sinus rhythm was achieved after IV infusion of propranolol.