Pro Dawgs are Bull Dawgs with a jointed internal harness. This specially designed harness allows the bull dawg to work head down giving the bait a "hop" when jerked and makes the bait run deeper. The added flex to the Pro Dawg gives the bait a different action than the original Bull Dawg. Both baits have a time and place, try a Pro Dawg in your arsenal, you will not be disappointed.