If they are both or even one of them is expected to be 50lbs or more when they mature, yes. This will ensure optimal slow growth and reduce their chances of developing bone disorders from growing too quickly. This is a problem that you can see in early life or sometimes it doesn’t show up until later in life as well. Genetics will play a role in this, not just nutrition.
Something about LA clearly isn’t agreeing with them, or their food has been switched too many times at this point being so young. I’ve suggested Pro Plan to many folks asking questions in the large breed puppy thread and have heard nothing but positive feedback. Many owners having the same issues you are having. I think it would be worth a shot for your dogs as well.
