Final answer:
An RVT is legally required to report signs of dog fighting, like when a dog has injuries suggestive of participation in staged fights, to law enforcement. Other situations mentioned do not legally mandate reporting, but may still raise welfare concerns.
Step-by-step explanation:
An RVT (Registered Veterinary Technician) may come across various situations where they observe or suspect inappropriate or illegal activities involving animal care. Among the given options, the instance that an RVT is required by law to report to law enforcement authorities is when a dog has injuries that are suggestive of a staged dog fight. This is considered a form of animal abuse and is illegal. Situations such as failure to provide routine veterinary care, having an overweight cat, or an owner using a non-recommended brand of pet food do not typically require mandatory reporting to law enforcement; although, they may raise concerns about the animal’s welfare.
Veterinarians and RVTs have a professional and ethical obligation to ensure the welfare of animals. When they come across clear indicators of criminal activity such as animal fighting, which is associated with public health risks, animal suffering, and other criminal acts, they must report this to the appropriate authorities.