I'm trying to teach our 6mo Cocker spaniel to be alone. I spend a lot of time walking, training and playing with her then leave her to her own devices for a little bit then pop her in the crate, act like I'm leaving, lock the front door and sit on the front step. After two minutes I can hear her crying and as soon as she hears me open the front door she stops.
How long should I leave her to cry in the crate? I currently leave her an extra minute or two before returning but I don't know if this is making it better or worse. Obviously I'm not going to leave her for 30 minutes crying solidly.