He sounds smart Maybe you can teach him to circle around the rocks and pick up the trail on the other side?

I have seen some round worms lion's stomachs, they were about 3 inches long but was only a few in each like 3 to 6. The lions had lots of fat on them and seemed very healthy...

Get them on some real game. Drags are for puppies and will quickly become old hat for good hunting dogs.