We all make rods for our own backs at times, Essie. Feeding by hand is something you can gradually wean him away from and is not a huge problem.
ALL MA dogs stay close to their "patient" whether you like it or not and get very distraught if they are separated from them for any length of time, which is why they get carefully assessed.
If you can get an xray done, it will answer the main question regarding the dog - is there something there that needs attention, or, is this a way I can get more of my Mum's attention.
Let me know what you decide to do and how you get on.