I have autism. I have a dog and although she is not a service dog I do find she helps me recover from meltdowns. A service dog would probably be good if it's possible for him to get one. They can be expensive though. There are other options to help with meltdowns too if a service dog is not an option. Fidget toys, anti-anxiety medication, and taking a break in a quiet environment also help me once I'm having a meltdown. I also take Geodon and Lamictal XR and the combination has helped to reduce the frequency of my meltdowns. Those two drugs don't seem to help once I'm melting down but they have helped prevent them from happening.