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Are you giving him any thing else--as in treats--I've known all too many owners who have shot themselves in the foot when trying to find a suitable food for a puppy. So if you are giving anything other that a chosen food, don't--at least don't while you are trying to find one that agrees with him.
Also as MeadowCat said--two weeks is a relatively short period of time when trying to determine if a particular food is going to better than another one.
There are things other than giardia that can cause ongoing diarrhea, soft stools, gas etc--coccidia is another pretty common one. And there is one that, if the puppy has been treated with antibiotics can cause an overgrowth of bacteria in the gut that will cause more problems and symptoms like those you are seeing.
And how much food are you giving this puppy--another cause of symptoms that might appear to be food related is simply feed the puppy too much food.
The ProPlan Large Breed puppy formula is similar to the adult ProPlan Focus Chicken and Rice. And generally the ProPlan Focus Sensitive Skin and Stomach is easier on the digestive system than even the chicken formulas.
So how much are you feeding him? Are you measuring it? Generally my male puppies at 7 months would be eating two cups of kibble per meal, two meals a day. But I also add things to their food usually a spoonful of yogurt in the morning and a hard boiled egg with dinner and I rarely add any kind of canned food, too many dogs, especially puppies don't seem to be able to handle canned.
I don't think keeping him on chicken and rice indefinitely is a really good plan--it lacks quite of lot of thing for a good diet. And why, if he did somwewhat OK on the ProPlan "Giant" puppy food, why didn't you continue to feed that? What was going on with him when he was eating it?
I would not attempt to add supplements of any sort without the help of a vet nutritionist until you actually have solved the immediate problems.
And just only raw chicken is NOT a complete diet for a dog--there is a big study on that and basically you need to be feeding a variety of meats, and including a specific amount of bone and organ meat in a raw diet.
If you aren't working with a vet to get this puppy on a consistent diet that agrees with him, that's the first thing you should do. And you should also ask your breeder if other puppies from this litter are having similar problems.
Good luck--I hope you get some help with this since having had ongoing problems for this long is really unusual.