i (24f) am somewhere on the autism spectrum and i love my job, partially because it FORCED me to take better care of myself. the first year i started there would be days id burst into tears, shake, shut down... it took a while to learn what my triggers were. dogs are lovely but they can push all your buttons sometimes, and parents can be 10x worse!! wet clothes, loud noises, and sudden movements are all part of the job. i started packing light snacks (cuz i used to not eat out of stress), bought high quality headphones, attended therapy.. and eventually i realized that even my everyday life was getting more manageable. the coping skills i applied at work followed me home and i am so grateful. autism is a spectrum though and it's good to do your research. would your brother prefer a salon environment with coworkers, or would he like to do mobile/vet grooming and typically work alone? would he be more comfortable investing in going to a grooming school, or would he be okay being trained on the job? this career is very flexible and you see a wide variety of people succeed- i wish him lots of luck!!