malloc() and free()

#include 
#include 
#include 

main( )
{ struct animal
 { char name[25];
   char breed[25];
   int age;
 } *pet1, *pet2;

 pet2 = malloc(sizeof(struct animal));
 strcpy(pet2->name,"Krystal");
 strcpy(pet2->breed,"German Shepard");
 pet2->age = 4;

    /*   now print out the data described above */

 printf("%s is a %s, and is %d years old.\n",pet2->name,pet2->breed, pet2->age);
 pet1 = pet2;    /* pet1 now points to the same structure that pet3 points to                        */
 free(pet2);     /* this frees up one structure                */

printf("%s is a %s, and is %d years old.\n",pet1->name,pet1->breed, pet1->age);
}