His defenses automatically moved to protect the family gold, so of course he got slapped in the face. Nothing new there, though.
"Hey! Cut it out. I'm not gonna hurt you!" He recognized inexperienced panic when he saw it. Jiraiya had a firm grip on the hoof that had attempted to neuter him and on the hand that had slapped him, but he needed two more to stop Donkey Show from flailing.
"Barton-kun! Help me restrain this thing, won't you?"