enum color { RED, GREEN, BLUE };

public class Dog{
       String breed;
       int age;
       String color;

       void barking(){
           //code here
       }

       void hungry(){
           //code here
       }

       void sleeping(){
           //code here
       }
    }

Dog fluffy = new Dog();

fluffy.breed = "ovcharka";
    fluffy.age = 10;
    fluffy.color = "searij";

fluffy.barking();
    fluffy.hungry();
    fluffy.sleeping();

class Dog{
       public Dog(String breed, int age, String color) { //это контсруктор
           this.breed = breed;
           this.age = age;
           this.color = color;
       }
       String breed;
       int age;
       String color;
    }