Yes, it does sound like you're referring to anal glands. He has two of them, one on either side of the anus.
No, he doesn't need them. Dogs can have them surgically removed and usually are much happier for it.
If you want to try a non-surgical solution first, you can increase the amount of fiber in his diet. Plain canned pumpkin or cooked sweet potato are good for this. Normally the anal glands empty when the dog has a bowel movement. Increasing the amount of fiber in the diet can make his stools firmer, putting more pressure on the glands when he defecates, and this helps them empty naturally.
Another option would be to have your vet teach you how to express them manually. This isn't for everyone. It does involve getting up close and personal with your dogs rear, it smells bad, and some dogs object quite forcefully.
If that doesn't work, discuss surgery with your vet.
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