Error while creating object instances in Java

You have used static access modifier and static variable shares memory for every class object.If you do not want then just remove static from age,name , breed

public class Dog{
        int age;
        String name;
        String breed;
        public Dog(String name,int age,String breed){
            this.name=name;
            this.age=age;
            this.breed=breed;
        }
        public Dog(String name,int age){
            this(name,age,"greed");
        }
        public static void main(String args[]){
            Dog high=new Dog("luffy",19,"pomerian");
            Dog low=new Dog("gold",32,"german shepherd");
            System.out.println(low.name+" "+low.age+" "+low.breed);
            System.out.println(high.name+" "+high.age+" "+high.breed);
        }       
 }

All of the static fields are shared (static fields are per class), but you expected instance fields (per instance). Change

static int age;
static String name;
static String breed;

to

private int age;
private String name;
private String breed;

And you should probably have accessor (getters) methods - and your printing would be simplified if you added a toString(). Like,

@Override
public String toString() {
    return name + " " + age + " " + breed; 
}

Then you can print with just

System.out.println(low);
System.out.println(high);

In your code Change Static to private :

Exmple :

 public class Dog{
            private int age;
            private String name;
            private String breed;
            public Dog(String name,int age,String breed){
                this.name=name;
                this.age=age;
                this.breed=breed;
            }
            public Dog(String name,int age){
                this(name,age,"greed");
            }


            }
            public static void main(String args[]){
                Dog high=new Dog("luffy",19,"pomerian");
                Dog low=new Dog("gold",32,"german shepherd");
                System.out.println(low.name+" "+low.age+" "+low.breed);
                System.out.println(high.name+" "+high.age+" "+high.breed);
            }       
     }

Output :

luffy 19 pomerian
gold 32 german shepherd

And Also :

 public class Dog{
        private int age;
        private String name;
        private String breed;
        public Dog(String name,int age,String breed){
            this.name=name;
            this.age=age;
            this.breed=breed;
        }
        public Dog(String name,int age){
            this(name,age,"greed");
        }

        void toStrig (){
         System.out.println(name+" "+ age+" "+breed);
        }
        public static void main(String args[]){
            Dog high=new Dog("luffy",19,"pomerian");
            Dog low=new Dog("gold",32,"german shepherd");
            high.toStrig();
            low.toStrig();
        }       
 }

Output :

luffy 19 pomerian
gold 32 german shepherd