You won't see this as bonus material on the LOONEY TUNES GOLDEN COLLECTION dvd series.
Here is a brief sequence from the 1944 George Pal Puppetoon, Jasper Goes Hunting featuring a rare, authorized, cross-over of one studio's star cartoon character appearing in another studio's animated short subject series. This cross-over was approved shortly before Leon Schlesinger sold his studio, and characters, lock stock and barrel to Warner Bros. Nothing like this would happen again until Daffy Duck and Porky Pig Meet the Groovie Goolies in 1972—and the cameo appearances in Who Framed Roger Rabbit? (1988). Mel Blanc does the vocals (of course) and Robert McKimson drew the animation. Paramount owns the rights to this film, all the Puppetoons, Fleischer cartoons and Terrytoons... (don't get me started)... so don't hold your breath expecting to see these on dvd anytime soon.