He's all growed-up at 12-MO - not a 'puppy' anymore.
The thread-title is a bit confusing - "anal-glands EXTRACTED" to me = surgically removed; he still has 'em, they've been manually expressed
I try to avoid manually-expressing anal glands, if at all possible; they lose muscle-tone & become dependent, more prone to blockage, abscess, & impaction.
What does he weigh, & is he in good lean condition?
Obesity or even pudge can make anal-gland issues worse. U should be able to feel the edge of each of his ribs, with only slight pressure - if U have to *push* to find the rib's back edge, the side toward his tail, he's carrying extra padding.
Even if he's lean, adding pureed pumpkin / canned plain pumpkin to every meal is a simple way of helping his anal-glands express all on their own. Pumpkin is GRAS / Generally Regarded As Safe, & most dogs love the stuff. It's low-carb, smells & tastes sweet, is low-calorie, & has loads of soluble & insoluble fiber.
If he needs to lose wt, substituting
1/4 to 1/3 the volume of each regular meal with pumpkin helps to peel off the flab the same way it went on - steadily, week by week.
Don't cheat & eyeball his meal - measure it each time; substituting
& keeping the volume the SAME means that he feels no deprivation, & won't dive into the trashcan or snatch a month-old chicken-bone up off the bike-path to swallow it. [Unless of course, he already does that.