Dragon guides for blind people, complete with a little harness that won’t affect wing movement if they have wings.
Emotional support dragons for people with PTSD or anxiety; they sense an oncoming panic or flashback episode and guide the person to calmness or help them stay grounded if they dissociate / derealize / depersonalize.
Seizure dragons to help people with epilepsy or seizure disorders; they sense a seizure coming on and take care of the person. (What is done would depend on the type of seizure.)
Support dragons for autistic people; they do things like lead the person someplace quiet if they sense sensory overload and they’ll curl around the person for pressure stimulation, purr (vibration / sound) or offer their head or back or tummy for petting as a calming tactile stim.
Service dragons that help people with limited or no hand use; they go fetching things or helping them around the house and assisting them when they’re out and about.
And so on and so on…