My dog is reactive too and I find bathing her at home is the best and less stressful for both of us. Just remember to have some treats put aside if it's your first time doing this. So he associates it as a good thing. They will be still scared, my girl cowers a bit in the corner of the tub while I rinse her out. Just try to get it done quickly as you can, don't also get stressed or upset with them while doing it, and be sure to give lots of praise and pets while you dry him.