These are all in Charles County, but my neighbors, who own pits and shepards, are all fans:
Applejack K9 Training
Sit Means Sit Dog Training

Anyone know a good trainer to deal with our reactive German Shepherd? He is a rescue and got in a scuffle with a smaller dog and we need a professional to work with him. I don’t think he’s ever going to love other dogs but I need him to have recall and ignore them.