Lead in catch dogs

We don't lead our catch dog he follows if we are on foot or riding the mules, I usually catch him and lead him from about 75 yds then send from about 20 yds or less, the catch dog I have now is 3 past and have had him since about 9 or 10 mths old, one time he slipped off to the dogs that were bayed while we were unloading the mules and closing the trailer etc he went a little over 500 yds. We cut a good boar(200 lbs on the scales) off last winter that had ran up in the teens for miles and saw him angling towards us about 150 yds out headed for the road, the catch dog went down the road cut the hog off and caught him. Long story short he will go a long ways but I rarely send very far.