I don't really know much about this (and sorry for going a little off topic) but does it cause them any pain/discomfort if they need emptying.
The think is Cosby has never once had a problem and we've never had to empty his (I think groomer does them occassionally). However Boo has started dragging his bum on the floor and whining and his breathe does smell (a mixture of fish and metallic). We didn't realise this was his anal glands and thought he needed worming, however he's still doing it.
Obviously I will take him to the vets now that I know what is going on, but I worried that he has been doing this for some time - will it be painful for him?
Bad mummy, bad bad mummy!