7.4. Ivan Ivanovich bought a dog. Sasha thinks that this dog is a black poodle, Pasha considers her a white bichon, and Masha - a black bull terrier. It is known that each of the kids correctly guessed either the breed or the color of the dog's fur. Name the breed of the dog and the color of its fur.
Solution. The dog is black, i.e., the color was guessed by Sasha and Masha, because otherwise, they should have guessed the breed, and the dog cannot be both a poodle and a bull terrier at the same time. Therefore, Pasha guessed the breed, i.e., the dog is a bichon.