
I have the same breed as you, and found that the breed specific food was nowhere near as good as the RC mini adult. I change my bitches over to the mini junior around week 6. Simply because mine never seem to go 9 weeks anyway. Maidens especially only tend to carry for 8 weeks (totally viable whelps.)
Like Marianne, I do start them on Nature Diet as well. I find that giving all dry food isn't well tolerated when their mouths are sore from cleaning pups.
As I am considering a change, my present pups and mum are having a half and half mix with the dry food. If you are looking for a suitable size kibble for toys, I am using the puppy small kibble from fish4dogs mixed with RC. I can certainly recommend.