puppy wont eat but snacks

At 9 weeks he's still cutting teeth so his mouth is likely sore.  He needs to be eating several times a day.  Try smashing up some of the kibble (plastic bag doubled + hammer) and see if he eats more. 

Use his kibble as training treats.  You may be giving him too many treats and he's not hungry at meal time.  You might also try adding some water to his kibble and letting it soften for a little while. 

How much are you feeding him? How many times a day?

Stop using treats during training sessions and use his kibble. I used to hand feed one entire meal and use that time as a training session.

Puppies especially won't starve themselves. Put his food down for 20 minutes, if he doesn't eat, pick the bowl up and wait until his next mealtime. 

Welcome to the forum and the joys of puppyhood!

Kibble too big? I found that none of my pups would eat big kibble, only the little ones but then my pups were all small.

I agree with stopping the treats.  Kible is a great "treat".

At nine weeks as I recall, my pups would still be getting 4 small meals per day.  And they were softened kibble...I just used warm water and let it sit for a few minutes.  I'm not into free feeding, so in my house there is a defined meal time.  20 minutes is plenty long enough for the pup to eat, then pick the bowl up and wait until the next feeding time to offer what's left.

Because you have a large breed puppy, you should be looking at either an excellent "all stages" food, or a large breed puppy food.  You don't want a gsd to grow too quickly.

Glenda, the OP said the pup is being fed Authority large breed puppy food.  I think that's Petsmart's house brand. 

I missed that.  Thanx Jackie!

The three GSD puppies I've had were not big eaters at that age.  They gobbled up treats during training but were either too upset with crate training or too hyper to sit still and focus on one thing long enough to eat a meal at that age.  I fed them lots of small meals all day.  Size of kibble should not be an issue, I've seen 7 week old GSD puppies eating a whole animal.  If the dog appears otherwise healthy and good weight I wouldn't worry about it too much.  It took each of mine a month or two to settle into a routine that involved eating larger meals.  If the puppy likes to hunt food, I sometimes scatter the kibble around the house and yard (but not in areas where they potty) and let them make a game of hunting for it.

The very best food on the market might not work for your pup, so it's kind of relative.  What I look for in a food is no corn, wheat, soy, grain fragments or grain glutens.  I want a NAMED meat as the first or second ingredient, such as chicken and not the generic poultry.  I like for the first two ingredients to be meat and meat meal in either order.

My gsds as youngsters ate either Innova or Blue Buffalo.  Those are my personal favs, but that doesn't mean they are the best or the only thing you should feed.

I looked at the label on the Authority food and it's a decent food.  I generally look for the protein in meal form and the Authority puppy lists chicken as the first ingredient and then chicken meal.  You can look at this site for more info about dog foods.  As stated on the site, corn isn't any worse than any grain product.  You just don't want it as the main source of protein. 

http://www.dogfoodproject.com/index.php?page=betterproducts

ETA this paragraph

  I attentively watch the diet of my dog.