My puppy is now 6 and a half months and I think is now able to go from the Pupy food to the Junior brand of JWB.  I was just wondering if I have to slowly introduce it as if it was a brand new food or whether it should be ok just filling her bowl with the new food once the bag of Puppy food has finished??

Thanks

Would change it slowly over the course of a week. Do not know your breed so can't say if 6 months is too young to change or not, if you can ask the opinion of the breeder.

I use JW for growing dogs and mine are on puppy to 12 months then Junior until 2 years. As it's the same food I've never introduced the new age range slowly, just from one day to another.