Why string assinging pointer is not conceder as dangling pointer?

Why we mention string assigning character pointer as a dangling pointer in below code ?

void func()
{ 
    char    *ptr;
    *ptr    =   "dog"; 
    char    *p1 = malloc(sizeof(char));
    char    *p2;
    *p1    =    'a';
    *p2    =    'b';
}

Here p2 is called 'Dangling pointer' but *ptr is not calling dangling pointer. Why is it so ?