In Old Yeller What deadly disease does Sanderson warn Travis about?

In "Old Yeller," Sanderson warns Travis about rabies, a deadly disease that can affect animals and humans. He explains that rabies is often transmitted through bites from infected animals, particularly wild ones like coyotes or wolves. The threat of rabies becomes a significant concern for Travis as he navigates the dangers of protecting his family and their livestock. This warning sets the stage for the emotional climax of the story.