Don't feel so sorry for Monty... If I'd have taken a video you would have heard a volley of ear piercing woofs to let me know he was stuck. 
It's a bit frustrating, marooning himself behind things -such as a dish on the floor - is bizarre, especially when you could shake a jar of biscuits in another room and he will suddenly be able to squeeze past it if he puts his mind to it. There's definitely a link here to his surface phobias, I've had to buy another new mat for the conservatory this week so he doesn't have to walk on the laminate anywhere , especially when he's stepping down off the sofa. He even seems to get stuck on his raised bed sometimes, whining gently until you encourage him to stand up and step off it.

It's a bit frustrating, marooning himself behind things -such as a dish on the floor - is bizarre, especially when you could shake a jar of biscuits in another room and he will suddenly be able to squeeze past it if he puts his mind to it. There's definitely a link here to his surface phobias, I've had to buy another new mat for the conservatory this week so he doesn't have to walk on the laminate anywhere , especially when he's stepping down off the sofa. He even seems to get stuck on his raised bed sometimes, whining gently until you encourage him to stand up and step off it.