Identifying the Cow's Condition

During the summer, Jenna was excited to visit her grandmother's farm. The farm had many animals, including cows, sheep, and chickens. Jenna particularly loved the cows because they were quiet and friendly. One day, while walking in the field, she saw a cow that seemed to be feeling unwell. Its eyes were dull and it was lying down in the grass. Jenna quickly decided to alert her grandmother. It was important to make sure the cow received the proper care and was not sick.

Jenna's grandmother said the cow needed to be examined by a vet, as it could be showing signs of _____. What word best fills in the blank to describe the condition of the cow?