Honestly, I don’t know. If he had stood his ground which legally he could do, they may have hurt the dog.
The amount of time and money that goes into a service dog is huge. Personally, I wouldn’t have taken the chance either.
Perhaps this is a blessing in disguise. He is letting it be known that this is the reason why he left the school. The law was with him but it really wouldn’t help him at all to have the law on his side and his “right arm” cut off.
We started training an Autism Dog. She turned out to be too hyper, but really got no grief about her being anywhere. She was vested (you don’t have to) and we carried DOJ paperwork for her. Mostly, we were never hassled, but we were just training. Had I needed her, I’m not sure I would have put her in this kind of risky situation either.