German Shepherd dog

The sonic wall unit I tried didn't work at all.  

I like the Dogtra YS300 bark collars.  They are advertised for small to medium breeds but work great on my GSD's and are lighter weight then the large breed models.   

The citronella collars did not hold up and came apart at the seams.  When I called and returned them they tried to say the dogs had been to hard on them and must have bumped them into things.  The collars were not very used at the time.....  Didn't work well either though do make a good dummy bark collar now when needed.  Darned expensive dummy bark collar....

Don't waste your money on the sonic unit.  I was given one and the problem barker just barked more at it. It did'nt work and I had to wash all the dog slobber off the wall around it.  I have had good luck with the tritronics.collsrs