My Lilli is the same way, I remember when we went to get her CGC certified it was 9:00 in the morning and I just knew it wasnt going to work but we tried it anyways and she froze up would not move and the lady ask me what was wrong and I hated to tell her my dog hates wet grass but I had to ask her if we could come back around 1:00 to retake it LOL
we came back and she passed with flying colors LOL.