My dog gromer does the "full meal deal" I call it ... the clean teeth, cut, wash, brush, cut nails, clean ears and yes express the anal glands... Please ask your Vet first. Do you find any dark brown oily spots on the floor?
I got this info from the "Complete idiot's guide to Yorkshire Terriers" I recomend it to anyone with a Yorkie I've learned a lot!
They are so loveable