Based on the descriptions and events in this excerpt, we can infer this about Cujo:
Textual evidence refers to the facts that are used to back up the inferences that are made from the reading of a sentence. The excerpt shows that Cujo was a wild dog that was now infected with rabies.
This can be proven by his watery eyes which also gave off some thick mucous. People who were not careful around Cujo could be bitten because of its wild state. Thus, the above inference is reached.
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