I had the same thoughts about anal glands untill one of my dogs developed a problem with one of her anal sacs. Now I do it monthly and it is extremely easy and not messy or smelly. I just put on a latex glove and express the sac internally which gives her a lot of relief. A good dob of KY jelly is essential to the process. You should have seen the look on the young male pharmacists face when I told him what the KY jelly was for, I dont think he entirely believed me judging by the smirk on his face LOL.
I always inspect my boys bits during grass seed season. I guess one had to do what one has to do. I always have latex gloves and KY jelly on hand for the messier jobs.