Weighted box jumps ( having a 5lb weight vest for example and having him jump onto something, this will give the dog explosive power just as you see football players jump out of pools to build there legs and once again be explosive)
Uphill sprints. Not jog but sprinting once again if your dog can do a uphill sprint /no more than 30 feet add harness for him to pull some weight.
A spring pole is excellent as well.
Take a dog to a stadium have it run up and down stairs with a weight vest. Remember a dog is fragile and u can't slap on a 30 pound weight vest nor would u want to.
diet is going to be about 80% of your results so have that in order before u beginany training.