We recently got our first puppy, a 9 week old French Bulldog, and am trying to get him used to being by himself in a crate before we go back to work. is it best to take a slowly slowly approach (10s, 20s, etc) or put him in for 2 mins and if he cries, wait for him to calm which will increase the time hes in there? to help calm him, should I sit by the crate and reassure him or let him do it all by himself? I really dont want to pick the wrong one and open the crate too early and give him bad habits. during the night, he cries for up to 20mins after we've come back in but then settles himself. does this mean he knows what to do or is this only cos its nighttime? Thank you for your advice!