A movie about talking dogs from space (?) where at the end of the movie, a little boy asks the dogs to stay on earth. The dogs receive permission to stay on earth, but the condition is that the dogs loose the ability to speak english.

All dogs go to Heaven??

It's Good Boy (http://www.imdb.com/title/tt0326900/) with Liam Aiken and Matthew Broderick

The name of the movie you are asking about is called GOOD BOY. Really liked this movie.