Dog dribbles pee in house?

My 6 year old Chessie has been dribbling urine after she comes back in the house on and off for a couple years now. I've had her to the vet and she has been put on antibiotics in the past but now it's back again. What can cause this dripping of urine? During my visit last week to the vet he ran a blood test and took X-rays as she's also stopped jumping up into my truck and car. The X-rays showed arthritis in her lower back between two vertabre. My question is can the urine thing cause pain when moving around or jumping up? She's a very active sporting dog and just recieved her JH title in late Sept.as well as completed another waterfowl season last month which required alot of running and swimming at which time she she showed no signs of pain. Looking back now she stopped jumping up on our bed at night she would climb up instead.One other note, when the dribbling pee thing is happening she's nervous and follows me around like she doesn't know whats going on. My dog is 65 lbs. and in superb condition. Should I take her for another opinion or give it a little more time? I started her on Synflex about a week ago nad she had improved a great deal till the other night when she did jump up on the bed and let out a whimper, then she got all nervous and slowed down a great deal. I gave her half a rymadel the following morning and she now acts fine again. What's up with the pee thing? Can that be linked to the soreness in her back area?