I will resist the temptation to be glib and say "Food!" :wink:
As for what food thats very much a case of personal preference, both for the owner and the dog
Broadly speaking dog food falls into three main catogories
BARF (bones and raw food)
Tin food with mixer biscuit
Complete Dry Food
I would hazard a guess that complete dry food is now the most popular due to the convenience factor, followed by tins. Feeding a BARF diet, although having a lot going for it, is probably in the minority due to the effort involved in getting and preparing it
Whats he being fed on now? Is there any reason to change?
You'll probably get as many different answers to what's the best food, as there are posts, but if he is doing well on the food he has is there any need to change.
All puppies chew - and labradors do it more than most, for a number of reasons, teething, exploring (in the same way babies put things in their mouths), boredom, anxiety, but it is not related to food.