Personally I would not touch Bakers with someone elses barge pole let alone my own! And I'd sooner eat it myself then give it to my dog!!
Being a wet fan Nature diet is a supurb quality food!
If you are sold on dry look at one of the better ranges like Arden Grange!
As for the change! any you make needs to be gradual! Introducing to new mixed with the old over a period of time! That way you will minimize and upsets!!
DT