These are some place you can contact that will send you free samples. It takes time to get them, though.
http://www.yorkietalk.com/forums/yor...e-samples.html
Or, you can go to Lukes and get a sampler pack for one-stop shopping. It will have a lot of samples that are not in the above link, probably shampoo and snack samples, too:
Dry Dog Food Sampler Pack - Luke's All Natural Pet Food
All of the foods you will get from these links are excellent choices. See which ones your dog likes and go from there to see if they agree with agree with your girl. (Just because a food is high quality doesn't guarantee that it will agree with your dog's digestive system, it might work fantastic with one dog but cause problems for another).