What Fodder said, sometimes it isn't a natural thing for a dog to play tug. Heck, my shiba inu plays tug way better than my other two. He re-engages quickly when he wins, flipping his head with the toy in his mouth like "grab it again, lets go!" He played it from the get go, though. Katsu is getting there, and Steel is too - right now we're playing more fetch (Frisbee). I'm doing lots of letting them win. Steel, I let him win then pull out a 2nd tug to get him to re-engage. He'll drop the first and come for the 2nd. Rinse and repeat. Super short sessions, and usually at the end, he'll bring up the first in his mouth. Lots of praise/pets while he's in possession of the tug. I've made enough conflict with him in daily living that I'm trying to undo now.
Lure Coursing/FastCATs definitely!
High prey with good hunt - Barnhunt if it's around you (Steel goes crazy for this game).
You could try one of those DiscDog/UpDog games if she'll chase a Frisbee - she may be too young to jump right now, but rolling it on the floor is a good start.
Just about any sport can harness prey drive. You just got to learn how to manipulate it.
+ Kalbi CGC 6/21/2015
+ Blackthorn's Out of the Frying Pan NW1 ORT SEN SCN BCAT SIN RATN TKN (Katsu) 9/12/2017
+ Blackthorn's Skofnung CGC TKN RATI RATO (Steel) 07/23/2018