Muck,
Glad to hear it!
I am even more glad (pardon my horrible grammar) that you were able to calmly assess the situation, and accept the "remedial" fix, which will pay huge dividends in the end... it takes a big man to back up in training, and go back to what many feel is "puppy work"..... I know a ton of people that can't accept that their SchH III import needs remedial work to fix a problem.... they would never hear of doing run-bys, that is for green dogs
as for the "shark shaking"... is it really severe? because IMHO there is nothing wrong with a dog that is very intense, and really wants to kill its prey... as long as you make it a point to attempt to keep the dog as close to prey as possible vs. defense...