When You get your puppy from us it will be used to having food non-stop. Most, but not all of our pups have free choice food available till they go home.
I recommend starting to feed your puppy on a schedule as soon as you get your pup home. 3 times a day for the first couple months and then go to feeding twice daily and we feed our adult dogs once a day. See my “Dog Food” article.
You should present food to your puppy and what he/she doesn’t finish in let’s say 10 minutes should be removed and fed at the next feeding. You should not be leaving your puppy food out for him non stop anymore.
Do not start switching your puppy’s food thinking he doesn’t like. He simply is not hungry! Dogs have very few taste buds, it has nothing to do with the taste of your dog food.