static void Main(string[] args)
        {
            Cliente cliente     = new Cliente("Ezequiel", "Oggioni");
            Mascota perro       = new Mascota("Perro", "Merry", new DateTime(2010, 08, 16));
            Vacuna  vacunaRabia = new Vacuna("Rabia");

            perro.AgregarVacuna(vacunaRabia);
            Mascota gato = new Mascota("Gato", "Nala", new DateTime(2020, 01, 07));

            cliente.AgregarMascota(gato);
            cliente.AgregarMascota(perro);

            Console.WriteLine(cliente.MostrarDatos());
        }
        static void Main(string[] args)
        {
            Mascota mascota1 = new Mascota("Perro", "Lola", DateTime.Now);
            Mascota mascota2 = new Mascota("Gato", "Shina", new DateTime(2012, 05, 25));
            Mascota mascota3 = new Mascota("Gato", "Shazam", new DateTime(2020, 08, 17));
            Mascota mascota4 = new Mascota("Perro", "Piri", new DateTime(2018, 03, 09));

            Cliente cliente1 = new Cliente("Calle 123", "Pedro", "Perez", "4587-1254");
            Cliente cliente2 = new Cliente("Av 457", "Juan", "Alvarez", "4700-5478");
            Cliente cliente3 = new Cliente("Calle 999", "Alejo", "Nuñez", "7845-0478");

            Vacuna vacunaRabia = new Vacuna("Rabia");

            mascota2.AgregarVacuna(vacunaRabia);
            cliente1.AgregarMascota(mascota2);

            Console.WriteLine(cliente1.MostrarDatos());

            Console.ReadKey();
        }