This is my new favorite interactive dog toy, the Tug-A-Jug. I have to give credit to Tanner, the greyhound, at Aragon Greyhounds for introducing me to it. I love it because you simply unscrew the bottom and fill it with your dog's kibble meal.
Screw the bottom back on (I didn't really have to tell you that did I?) and give it to your dog. Just takes a minute. I purchased the small (8 inches long, 3.5 inches wide) size for the greyhounds. It is not so big that they cannot pick it up.