I'm not sure if there's some sort of outdated reply limit as some other forums have (like dont reply to posts 2-3 months old etc), but I just joined and wanted to share my input.
Yes I'm certain he can, but you basically have to perfectly predict his DI, In training mode where there's no DI (I think) wolf will always fall behind you, so you must tap the opposite direction WITHOUT dashing and regrab, or if the wolf DIs away you have to input a dash grab to catch him. I'm basically sure that the human reaction speed isn't THAT fast because I find it actually really hard to tell if the wolf's gonna land infront (without DIing away) or behind the Roy character until he's started to fall, which by then you're too late to input for a grab and he'd just tech away.
However, against no DI (I think, haven't tried on a human player) or Bots (from experience this basically works all the time), upthrow => turnaround grab => upthrow => turnaround grab until about 20%, then upthrow => up tilt (which will nearly literally swing wolf back to the front) and regrab, but seems to only work once. Then probably just Upsmash/shorthop backair. Idk