Autism service dog

Annabelle was diagnosed with Autism in October 2016. We have been battling the challenges with her being a runner. She doesn't realize the danger of cars and tends to run out into traffic; away from us if she is not in a stroller or on a harness. We are trying extremely hard to get her service dog trained for her, not only for the safety aspect of it but as well as support with her sensory and behavioural needs. Any support would greatly be appreciated. Please share our story.