What do I do???

Hey this question kinda links to my Diarrhoea thread! I have been sent a sample of Burns dog food but:
1: It says for dogs of all ages! my pup is 4 months old shall I try it on her?
2: I have 2 little packs (obviously as they r samples) but how do I change her onto this?
Do I just do it? or do it slowly? 'clean' out her system with fish and pasta firts or what?

I'm gonna be a pain over this but I want to do it right this time as it seems that last time didn't sit to well!

Thanks anyone

if you are going to change do it slowly
the slower the better for a young pup
i would use the smaples as a treat at first to see if she likes them and then go and buy a small bag of the puppy food and then start adding a little to each meal. as you add some take some of the other food out. ty to do this over about a week

cool ok then thanks dunno how to tell if shes likes it tho as she will try and eat everything lol. but I give her 7 hanfuls of mixed food anyway so I can do a handful different a day or something
Thanks