Training (Tucson)

Is there a program or volunteers that donate time to help owner train service dogs? Low to no income with proof.
Already have dog with basics and some basics of tasks.
Really need the extra help with tasking/alerting.
Fully utd vaccinated, neutered and licensed dog.
Quick to learn and eager.
Has the perfect temperament in public, non-aggressive, friendly Medium mixed breed.
If anyone knows of anything PLEASE contact me.
He is now three and been with me since 9 weeks.
*Not wanting to disclose image of dog on here, as he is well known working in public