I have a dog that has grown up with having the ease of a doggie door. She took to potty training very quickly. I got her as a puppy and she's 3 years old now. She wont go to the bathroom anywhere except her own backyard. Any suggestions? She knows what "go potty" means and even if I chant that on a walk she wont go. I've taken her camping and she went about 24hrs without going to the bathroom. She finally went in the morning because she obviously couldn't hold it anymore. Same thing happened when I took her to stay at my boyfriend's house. She didnt go until many hours passed and she couldn't hold it anymore. She doesnt have accidents but she is very restless all night long and I get concerned about her getting a bladder infection. Ideas?