Babysitter Needed for my Children

Looking for a great babysitter for a 7-year-old boy in Westwood available from 3-4:30 p.m. weekdays. He is the sweetest boy ever ( no exaggeration) and has developmental delays, which for practical purposes means he communicates more like a 4-year-old. We are also supporting him with toilet training. We need a babysitter with reliable transportation, who does not smoke and who is comfortable with a dog.