We have had our dog for 1.5 yrs now. She always goes through phases where she scoots on her butt lots. We have taken her to the vet for this and are told her anal glands get plugged and need draining. So as soon as she scoots we take her in and get them drained and then she seems OK. But now that winter is here (In Cananda - lots of snow)... this seems to happen more often. Is there something we can do or give her to prevent the frequency of this? We need to take her every couple months. Is there a cause of this?

You might find a groomer will empty them cheaper than a vet. You could ask the vet about removing them. I never have, but some people learn to empty them themselves. If you try, be very careful to hold paper towels over the anus.

My old Aster has trouble once in a while. I have speculated about switching to something like the regular Purina that produces larger stools, and see if that would drain them during bowel movements.