Multi-dog household, one dog urinating on couch... not a seperation issue

Question
Let me first say i am disabled and home all the time, so this can not be a separation issue. I have 8 dogs, most were rescued before i became disabled. Out of the 8 i have 2 that are Chinese crested powder. The mother belle and her daughter Gracie.
Belle was a puppy mill rescue and was pregnant when i got her. Grace was her sole surviving puppy who has been with me her whole life, she is 6 years old.
I had noticed for some time that there was at least one of my dogs who was urinating on my couch/recliner and i was not sure why. I bought pads with lil spikes to put on the couch seat area and my chair even if i just went to the bathroom. This stopped it for awhile. However there would still occasionally be a spot here or there (the couches/furniture is covered in blankets most of the time)
Tonight i finally caught my culprit. My husband had just left for work, I went to the restroom and came back, and caught grace peeing on a small corner of the couch that the pad had been pushed over just enough. Of course i corrected her and took her out. What i want to know is why? Grace has never seen a harsh days treatment in her life, has never wanted for anything (tho she is very shy and retiring- not uncommon for her breed) I don't know why she would act that way. She is not the lowest dog in the pack. She gets alot of attention. ideas?
ty

Answer
Even if the site of an accident has been well cleaned dogs' noses can still pick up the scent of past mishaps, so they will continue to look at that as a spot to go. She is not using this spot as a way of communicating an emotion to you, there could be a medical issue, or marking...you have to teach her again the proper place to toilet.

How much water is she getting? If it's down all day, try offering it to her a few times a day instead.

You might consider an indoor invisible fence, like the Innotek ZND-1200 Instant Pet Barrier. Less than $50. Use the lowest setting possible, follow the instructions carefully and most dogs learn pretty quickly which spots they should stay away from.

Start taking her outside on leash when you think she might have to go. If she has free access throughout the house it's harder to keep track of her. Structured toileting breaks are never a bad idea.

Good luck,

Josh Abrams
Founder, Dogasaur.com