It is possible that they were not completely expressed, especially if he did an external expression compared to an internal expression. External will give some relief, but it will not empty the glands. At the very least, I would give the vet a call and tell them that he is still having the symptoms. Have them check for a tumor which may be the problem with not being able to express the glands totally. I would also suggest adding a teaspoon or 2 of canned pumpkin or canned sweet potato to his diet to add some fiber to help firm the stool a bit. You might discuss changing his diet with your vet to help. A holistic dog food like Eagle Pack helps quite a bit with this problem. The fact that your vet put him on antibiotic tells me that the impaction was quite severe and he just may need what was left squeezed out. :) Take a look at this website for more information on anal gland problems and let your vet know the problem is still there :)
http://www.dr-dan.com/analsac.htm
Wishing you all the best and hope your boy gets some relief very very quickly. :)
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