Gland can be expressed by your vet or groomer. I am a groomer and we only do it on request, or when it is very obviously in need of doing. I was under the understanding (and I am not an expert here) that if a person expresses them too regularly, they tend to stop expressing themselves the natural way. That is why we only do it on request, because the owner know the dog best, and they should know if their dog can't express them the natural way. I would not recommend doing it yourself without being taught, but you can feel for them to jugde if you need to have them done or not. If you lift the dogs tail straight up, and then place your thumb and index finger on either side of the rectum, if you feel bumps under the skin at these points, ask someone to express them. They should not feel full.