According to a 19th century German true crime anthology, Como tu helped solve his master's murder.
One Saturday in the 1800s, a butcher in Seville Spain named Juan went hunting with his godfather Marquez for the weekend. When Juan returned home on Monday without Marquez, Marquez's wife became concerned. Juan told her they had separated during the hunt and he should be back soon. That evening, Marquez's dog Como tu, who accompanied the men on the hunt, returned home without his master. The dog appeared agitated and grabbed the wife's dress with his teeth, trying to lead somewhere. She disregarded the dog's behavior and assumed her husband was with some of his hunting friends.
The wife and dog went to Juan's house. When they got there, Como tu, who was normally friendly with Juan, sprang for his throat. Marquez's wife pulled the dog off, and Juan told her Como tu must have rabies and should be shot. She resisted him and decided to go to the police station. The wife told the police her story and how her dog had been behaving. The police even witnessed Como tu's behavior when the quiet dog suddenly became aggressive when he heard Juan's voice at the station. The police commissioner thought Juan might have abused the dog.
Two days later, the wife takes Como tu to the area where her husband had gone hunting, hoping to find him. When she came to a cliff over a river, Como tu grabbed her dress and tried to pull her forward. She pulled back, not wanting to go down the cliff, and returned home. As the two passed Juan's butcher shop, the dog tried again to attack Juan.
Marquez's wife went to the police station and told an officer about the dog's behavior near the cliff. The next morning, the officer went to the cliff and spotted three men at the bottom trying to pull blood-smeared clothing off a body. Juan was one of the men. The other two said Juan offered them money to help him remove the body and throw it in the river. All three were arrested.
Juan admitted to killing Marquez over a fight about a partridge. Both had threatened each other. Juan said he fired at Marquez, only intending to disable him, but his anger and drunkenness drove him to finish the job by hitting him on the head with his shotgun butt.
Because there was no evidence of premeditation and some evidence to support self defense, Juan was sentenced to five years in prison. The two men were sentenced to six months.