SO... is this one of those things that when you start doing it you will need to do it more often. I know some places say that if the dog has allergies then it probably needs to be done more often.I went almost 10 months w/ never having Zoe's expressed. She didn't seem to have any issues. Now, it's been like 2 weeks and as she was sitting next to me I smelled that smell (ugh!) I pulled up her tail and gave a gentle push and liquid came out. GROSS! Is there any rule as to how often this should be done? I was thinking that maybe I didn't get it all out and maybe should suck it up & just go to the vet. I just didn't want to go overboard w/ my first attempt and make her never want it to be done again. Surprisingly... she was very calm and didn't seem to mind. How often does everyone do this.. or have it done?