That will scare the puppy to death even more. Anyway he's got to get used to being left alone for 5 mins.
I think that was deliberately posed just for a "funny picture" as no way would a puppy stay still like that, and yes, they would probably be terrified.. Tikva is quite happy being alone if I go out to the macolet or to the big shopping centre, although I do keep her on her tether otherwise she would get into my bedroom and wreck my bed! She is so much like Pereg was in that pillows mean tissues under them, so dive under them and chuck them on the floor, and then leave bits of shredded tissue just about everywhere! But when I shower she does not like not to see me in the house if I disappear for longer than she likes, so she is quite happy to go in her crate as long as I pull it to the doorway of the ensuite so she can make sure I am safe. She thinks she has to watch over me in case I drown - or something!
I could always put Tikki in the big box on the back of The Silver Monster [having taken the lid off first] but I really want her to walk beside it, not sit in a box... or on the footplate... or on my lap...