Which of the following is a symptom of Bufo marinus/Rhinella marina toxicity?

Retching is a significant symptom associated with Bufo marinus or Rhinella marina toxicity, which refers to poisoning from the cane toad. When animals, particularly dogs, come into contact with the secretions of this toad, they can experience a variety of clinical signs due to the toxic compounds known as bufotenin and other cardiovascular toxins. Retching can occur as a response to gastrointestinal irritation or the body's attempt to expel toxins, indicating that the animal is experiencing distress. The presence of this symptom is a critical indicator for veterinarians to recognize potential toxin exposure and to initiate appropriate treatment promptly.

In contrast, while the other symptoms listed—hiccups, excessive yawning, and restlessness—may occur in various situations involving mild distress or anxiety, they are not specifically indicative of Bufo marinus toxicity. Understanding the distinctive symptoms of various toxicities is crucial for veterinarians to provide timely and effective care.