My dog is a mix breed of maybe beagle/boxer/pit bull, we’re not really sure and he is around 5months old. When we first got him he was around a month, and has been trained to use the puppy pads. We got another puppy last month, and he’s 3 months. When we first got the new dog we began potty training outside. The newer puppy is just fine using the bathroom outside, but the older one is not cooperating well. I was wondering if I could get some advice on how I can get him to use the bathroom outside and stop going inside. We think he might have slight anxiety, he hates the dark and being alone and will start whining for 15-20 minutes with no noticeable cause.