Correct the sentence .... Teacher : Male Dog and female dog are playing with a bone. Student : Female dog and male dog are playing with a bone

The student's answer is correct because swapping the order of the noun phrases (female dog and male dog) does not change the meaning of the sentence. Both versions communicate that two dogs of different sexes are playing with a bone. English word order is flexible in this context when both noun phrases refer to the same animals being described. The teacher's sentence and the student's sentence are semantically equivalent.