LOL we see this thread a lot lately it seems. When I was teaching Shasta to speak, I actually had to bark at her. One trick that has worked for others is getting the dog frustrated. Example would be withholding a toy the dog favors and mark when they make a noise for it. Doesn't have to be a bark. A grumble. You work your way up to the bark. Make sense?
Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus BCAT CAX2 CGCA ETD HCT NCO-1 PKD-T RATI RATN RA TC TKA 3/18/2013
"Hades" Guilty vom Blutfeuer 10/26/2018
Zena GSD 6/1/03-2/16/2016
Riley GSD/BC 1/10/05-2/1/2013