Maybe I'm wrong, but wasn't Reina left alone with a dog a few episodes back? And now she acts as like she's afraid of dogs? Something's wrong here, or that episode where she was left alone with he dog was a REAL punishment 
well it is true that couple episodes back Reina was lefted with a dog twice in the episode, but that dog was pretty much a friendly dog that won't do anything. I haven't seen this episode yet so I can't comment on the behaviour of this new dog they shown.
but with my experience in working in a dog shelter (and I'm still working there), even I'm very good with all the dogs there (like Sheppards, Pitbulls, Bulldogs, Rottweiler,etc which are all big dogs and aggressive ones) I'm still caution to them despite they are good or not. And often small dogs are more danger than big ones because they aren't trained well and don't behave as good as big dogs do.
Therefore even if Reina wasn't scare of that fluffy one back then, she may still scare of this "new" dog if this one behaves inappropriately.
