To find the best biscuits or doggie treats for puppies, I would go online to Amazon.com and type in "dog treats" in the search field and then select 4 stars and up on the left column under "Ave Customer Review." to narrow it down. From the shorten list of items, I would then go through the customer ratings/reviews, ingredients, prices, etc., until I find the "best" one(s) for me.
You might not necessarily buy from Amazon or other online pet stores, but you can surely use the information you'd get on the internet to make better decisions when shopping at your local (pet) stores for the best biscuits or treats for your puppies/dogs.