Obviously, animal proteins should come
primarily from prey that a fish might actually encounter in the wild.
Plague can be spread a number of ways, but ferrets contract the disease
primarily from their prey, the Prairie Dog.
Not exact matches
There is no way of knowing for sure exactly what constituted the diet of the ancestors of the modern, domesticated, dog and cat, but we can estimate that it consisted of about 85 to 90 % meat (
primarily from whole
prey) along with small amounts of fish, eggs, scavenged grasses, berries, nuts and other vegetation.
A quote
from Wikipedia's Sighthound page: «Although today most sighthounds are kept
primarily as pets, they have been bred for thousands of years to detect movement, chase, capture, and kill
prey primarily by speed.