[Michael Romanos]

I do not recommend at all that you grab a Corgi by his/her neck and lift them up. I would definitely think my beautifully natured Corgi would bite me too if I tried that. Giving your pup a lollypop- stick gave the pup the impression the whole item was as precious as a bone. I would not want to rip a bone I gave my Pem away from him without careful planning and endeavour. Present your pup with an alternative. Don't forget he was already in a vunerable, strange maybe stressful situation - having a bath and maybe puting up with inexperienced hands and handling.
It seems you may have created a touching issue. You may have made his neck a no go place - some handlers/owners have angered Corgis in grabbing their feet or the rear part of their bodies - and they react to more touching or grabbing with anger having had bad experiences. You'll have to earn his trust again.