Goose Poop!?

I have had my new cockapoo puppy (Maisey (8-23-10)) for 2 months now, and she has had giardia twice already. She may have had it already when I got her, but she keep eating goose poo whenever we go outside! Any one have any ideas on what to do?

Also, anyone have any good suggestions for dog food. I am currently using Wellness Puppy, but I think she is allergic to it. What type of meat should be the main ingredient (fish, lamb, beef, etc)?

Thanks!