Which emergency treatment is most appropriate for a Yorkie presenting with seizures and tetany after giving birth?

In the scenario of a Yorkie experiencing seizures and tetany following childbirth, the most appropriate emergency treatment is calcium gluconate administered intravenously. This situation likely indicates a condition known as eclampsia or hypocalcemia, which can occur in nursing dogs due to the increased demand for calcium during lactation.

Calcium gluconate works by rapidly increasing the calcium levels in the blood, addressing the immediate needs of the nervous system and reducing the risk of further seizures and muscle spasms associated with calcium deficiency. The rapid onset of action is critical in emergency situations, particularly when seizures are present, as they can lead to significant morbidity if not treated promptly.

While other treatments such as anticonvulsants like phenobarbital or diazepam may be suitable for controlling seizures, they do not address the underlying cause of tetany and seizures related to low calcium levels. Tetanus anti-toxin would not be appropriate in this case as it is specific for tetanus caused by Clostridium tetani and not relevant to the symptoms exhibited by the Yorkie after birthing. Thus, the administration of calcium gluconate is the most immediate and effective treatment in this scenario, as it directly addresses the clinical signs of hypocalcemia.