i started this question with the introduction. then differentiated the meaning between lap dog and watch dog term. watch dog term is related to a type of organization which keeps strict watch on illegal activity of public as well as private organization. after that i explained it according to journalistic point of view(http://en.wikipedia.org/wiki/Watchdog_journalism). having said this, I begun to explain the term lap dog. At that time I did not know the meaning of the term, yet I explained it correctly(http://en.wikipedia.org/wiki/Lapdog).
next, i wrote the watch dog role of TV channels like highlighting corruption scandals, showing hypocrisy of politicians etc.
finally, i wrote the lap dog role of media( a type of media which is loyal to one entity or another or submissive type of media) which favors one party over other.
In conclusion, I summarized the whole discussion and wrote some suggestions