Another thing – did Cora save Pongo on purpose? Could she have imagined he would be used to help frame Regina? Does she know Rumple so well that she knows his methods? For example, instead of paralyzing the dog, she could’ve let him keep on barking so that the people around would be more alarmed and surely some witness would’ve noticed Regina/Cora leaving?
Letting Pongo bark would only draw attention and risk being captured. She didn’t want to get caught. If the plan was for everyone to think Reggie had done it so that Reggie would break then getting caught would have ruined that. The gig would have been up when there were two Reggies. She wanted the clean getaway with Reggie being hauled in after the fact.