Our Moxie was on her own for a long time in her life prior to the rescue so her nails did not get trimmed properly. It appears now that the "quick" is near, or at, then end of the nail and I am just wondering how we (or a groomer) would go about trimming them? Is this painful for the dog?

Some vets will do a "show cut" on the nails which is basically cutting the nail back to a healthy length. The dog should be sedated for that and I would imagine it's not totally comfortable initially. But for some dogs it's necessary because of the sheer length of the nails.

If you can get Moxie on a nail trimming schedule with a grooming salon it can get the quick to recede back a little bit. I'd probably suggest dremeling over nail trimming if her nails are really that long, it seems to be more effective since there's not much you can trim off if her quick is to the end.

Ditto on what Kristina said!