To save OP time, the hound's name is Oslo and it can change it's size. Ban scares it with his killing intent. This happens before Ban and King fight. That's literally all that happensI read it after watching last sunday's episode and caught up, it felt fine.
They did leave out King's hound that was supposed to have appeared already, it plays a bigger role later on so you may wanna read from the start of the current arc. Although it's not all that relevant.