Walter (8 week old goldendoodle) was doing really great with his crate the first 5 days we had him, but is not whining/barking/scratching at his crate to get out. I'm having a really hard time knowing if he just WANTS to come out, or actually has to go to the bathroom. If I let him out when he whines and then doesn't go, I feel I'm reinforcing his whining, but if leave him in there and he DOES need to go, I'm worried he'll have an accident. What should I do??