My dog won't go to the bathroom alone outside. Is it separation anxiety?

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Poor Pippin!

Sometimes dogs as they reach social and behavioral maturity between 2-3 years old will have changes in behavior and that includes anxiety. Another possibility is that something triggered this fear of being alone outside: fireworks, thunderstorms, etc. I would try to desensitize her so eventually she will go out on her own. I would recommend contacting or seeing your Vet for medications. I would prescribe prozac and a short acting sedative while you help her through this. It hopefully will not be a permanent thing but to be used long enough to hopefully fix the problem. While she is on the medications you will have to go out with her every time she is outside. Start with a leash then get rid of the leash and eventually get further and further away to the point you can maybe stand at the door where she can see you. If that goes well maybe she will go on her own with you inside. It will not be a quick process. It will take time and effort on your part.

Good luck!